diff --git a/assets/css/woocommerce-smallscreen.scss b/assets/css/woocommerce-smallscreen.scss
index 0309d868849..9c7cf8cd6f3 100644
--- a/assets/css/woocommerce-smallscreen.scss
+++ b/assets/css/woocommerce-smallscreen.scss
@@ -41,7 +41,7 @@
 				text-align: right !important; // Important to overwrite order status inline styling
 
 				&.order-actions {
-					text-align: left !important;
+					text-align: left !important; // This must always align left on handheld
 				}
 
 				&:before {
@@ -109,7 +109,7 @@
 
 				&:nth-child(2n) {
 					float: right;
-					clear: none !important;
+					clear: none !important; // This should never clear.
 				}
 			}
 		}
diff --git a/assets/css/woocommerce.scss b/assets/css/woocommerce.scss
index 296f391165b..53daff01c87 100644
--- a/assets/css/woocommerce.scss
+++ b/assets/css/woocommerce.scss
@@ -69,13 +69,13 @@ p.demo_store {
 		text-align: center;
 		line-height: 1;
 		border-radius: 100%;
-		color: red !important;
+		color: red !important; // Required for default theme compatibility
 		text-decoration: none;
 		font-weight: 700;
 		border: 0;
 
 		&:hover {
-			color: #fff !important;
+			color: #fff !important; // Required for default theme compatibility
 			background: red;
 		}
 	}
@@ -1496,13 +1496,13 @@ p.demo_store {
 .woocommerce-message,
 .woocommerce-error,
 .woocommerce-info {
-	padding: 1em 2em 1em 3.5em !important;
-	margin: 0 0 2em !important;
+	padding: 1em 2em 1em 3.5em;
+	margin: 0 0 2em;
 	position: relative;
 	background-color: lighten($secondary,5%);
 	color: $secondarytext;
 	border-top: 3px solid $primary;
-	list-style: none outside !important;
+	list-style: none outside;
 	@include clearfix();
 	width: auto;
 	word-wrap: break-word;
@@ -1521,9 +1521,9 @@ p.demo_store {
 	}
 
 	li {
-		list-style: none outside !important;
-		padding-left: 0 !important;
-		margin-left: 0 !important;
+		list-style: none outside !important; // Required for default theme compatibility
+		padding-left: 0 !important; // Required for default theme compatibility
+		margin-left: 0 !important; // Required for default theme compatibility
 	}
 }
 
diff --git a/includes/abstracts/abstract-wc-order.php b/includes/abstracts/abstract-wc-order.php
index 7e58fb15bec..c4f478aa3b1 100644
--- a/includes/abstracts/abstract-wc-order.php
+++ b/includes/abstracts/abstract-wc-order.php
@@ -1205,6 +1205,7 @@ abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order {
 
 			// Inherit tax class from items
 			if ( '' === $shipping_tax_class ) {
+				$tax_rates         = array();
 				$tax_classes       = WC_Tax::get_tax_classes();
 				$found_tax_classes = $this->get_items_tax_classes();
 
diff --git a/includes/abstracts/abstract-wc-rest-posts-controller.php b/includes/abstracts/abstract-wc-rest-posts-controller.php
index 6b634c0bf49..bea36577bcf 100644
--- a/includes/abstracts/abstract-wc-rest-posts-controller.php
+++ b/includes/abstracts/abstract-wc-rest-posts-controller.php
@@ -521,6 +521,8 @@ abstract class WC_REST_Posts_Controller extends WC_REST_Controller {
 
 		if ( 'include' === $query_args['orderby'] ) {
 			$query_args['orderby'] = 'post__in';
+		} elseif ( 'id' === $query_args['orderby'] ) {
+			$query_args['orderby'] = 'ID'; // ID must be capitalized
 		}
 
 		return $query_args;
diff --git a/includes/admin/class-wc-admin-status.php b/includes/admin/class-wc-admin-status.php
index 82191147e07..c1de87bc8d0 100644
--- a/includes/admin/class-wc-admin-status.php
+++ b/includes/admin/class-wc-admin-status.php
@@ -368,7 +368,7 @@ class WC_Admin_Status {
 		}
 
 		if ( ! empty( $_REQUEST[ 'handle' ] ) ) {
-			$logger = new WC_Logger();
+			$logger = wc_get_logger();
 			$logger->remove( $_REQUEST[ 'handle' ] );
 		}
 
diff --git a/includes/admin/wc-admin-functions.php b/includes/admin/wc-admin-functions.php
index 3f0fdbad604..45805de5405 100644
--- a/includes/admin/wc-admin-functions.php
+++ b/includes/admin/wc-admin-functions.php
@@ -62,9 +62,7 @@ function wc_create_page( $slug, $option = '', $page_title = '', $page_content =
 
 	$option_value     = get_option( $option );
 
-	if ( $option_value > 0 ) {
-		$page_object = get_post( $option_value );
-
+	if ( $option_value > 0 && ( $page_object = get_post( $option_value ) ) ) {
 		if ( 'page' === $page_object->post_type && ! in_array( $page_object->post_status, array( 'pending', 'trash', 'future', 'auto-draft' ) ) ) {
 			// Valid page is already in place
 			return $page_object->ID;
diff --git a/includes/api/class-wc-rest-coupons-controller.php b/includes/api/class-wc-rest-coupons-controller.php
index c42cfb5c11c..cd8badb979e 100644
--- a/includes/api/class-wc-rest-coupons-controller.php
+++ b/includes/api/class-wc-rest-coupons-controller.php
@@ -246,8 +246,8 @@ class WC_REST_Coupons_Controller extends WC_REST_Posts_Controller {
 		// Content.
 		$data->post_content = '';
 
-		// Excerpt.
-		if ( ! empty( $schema['properties']['excerpt'] ) && isset( $request['description'] ) ) {
+		// Coupon description (excerpt).
+		if ( ! empty( $schema['properties']['description'] ) && isset( $request['description'] ) ) {
 			$data->post_excerpt = wp_filter_post_kses( $request['description'] );
 		}
 
diff --git a/includes/class-wc-background-updater.php b/includes/class-wc-background-updater.php
index df0b2cda78b..02837f977a7 100644
--- a/includes/class-wc-background-updater.php
+++ b/includes/class-wc-background-updater.php
@@ -36,7 +36,7 @@ class WC_Background_Updater extends WP_Background_Process {
 	 */
 	public function dispatch() {
 		$dispatched = parent::dispatch();
-		$logger     = new WC_Logger();
+		$logger     = wc_get_logger();
 
 		if ( is_wp_error( $dispatched ) ) {
 			$logger->add( 'wc_db_updates', sprintf( 'Unable to dispatch WooCommerce updater: %s', $dispatched->get_error_message() ) );
@@ -97,7 +97,7 @@ class WC_Background_Updater extends WP_Background_Process {
 			define( 'WC_UPDATING', true );
 		}
 
-		$logger = new WC_Logger();
+		$logger = wc_get_logger();
 
 		include_once( dirname( __FILE__ ) . '/wc-update-functions.php' );
 
@@ -119,7 +119,7 @@ class WC_Background_Updater extends WP_Background_Process {
 	 * performed, or, call parent::complete().
 	 */
 	protected function complete() {
-		$logger = new WC_Logger();
+		$logger = wc_get_logger();
 		$logger->add( 'wc_db_updates', 'Data update complete' );
 		WC_Install::update_db_version();
 		parent::complete();
diff --git a/includes/class-wc-cart.php b/includes/class-wc-cart.php
index 83a785d6a66..4ad64013e66 100644
--- a/includes/class-wc-cart.php
+++ b/includes/class-wc-cart.php
@@ -1289,8 +1289,8 @@ class WC_Cart {
 						// Apply discounts and get the discounted price FOR A SINGLE ITEM
 						$discounted_price  = $this->get_discounted_price( $values, $adjusted_price, true );
 
-						// Convert back to line price and round nicely
-						$discounted_line_price = round( $discounted_price * $values['quantity'], $this->dp );
+						// Convert back to line price
+						$discounted_line_price = $discounted_price * $values['quantity'];
 
 						// Now use rounded line price to get taxes.
 						$discounted_taxes  = WC_Tax::calc_tax( $discounted_line_price, $item_tax_rates, true );
@@ -1312,8 +1312,8 @@ class WC_Cart {
 						// Calc prices and tax (discounted)
 						$discounted_price = $this->get_discounted_price( $values, $base_price, true );
 
-						// Convert back to line price and round nicely
-						$discounted_line_price = round( $discounted_price * $values['quantity'], $this->dp );
+						// Convert back to line price
+						$discounted_line_price = $discounted_price * $values['quantity'];
 
 						// Now use rounded line price to get taxes.
 						$discounted_taxes  = WC_Tax::calc_tax( $discounted_line_price, $item_tax_rates, true );
@@ -1356,14 +1356,26 @@ class WC_Cart {
 				// Cart contents total is based on discounted prices and is used for the final total calculation
 				$this->cart_contents_total += $line_total;
 
-				// Store costs + taxes for lines
-				$this->cart_contents[ $cart_item_key ]['line_total']        = $line_total;
-				$this->cart_contents[ $cart_item_key ]['line_tax']          = $line_tax;
-				$this->cart_contents[ $cart_item_key ]['line_subtotal']     = $line_subtotal;
-				$this->cart_contents[ $cart_item_key ]['line_subtotal_tax'] = $line_subtotal_tax;
-
-				// Store rates ID and costs - Since 2.2
-				$this->cart_contents[ $cart_item_key ]['line_tax_data']     = array( 'total' => $discounted_taxes, 'subtotal' => $taxes );
+				/**
+				 * Store costs + taxes for lines. For tax inclusive prices, we do some extra rounding logic so the stored
+				 * values "add up" when viewing the order in admin. This does have the disadvatage of not being able to
+				 * recalculate the tax total/subtotal accurately in the future, but it does ensure the data looks correct.
+				 *
+				 * Tax exclusive prices are not affected.
+				 */
+				if ( ! $_product->is_taxable() || $this->prices_include_tax ) {
+					$this->cart_contents[ $cart_item_key ]['line_total']        = round( $line_total + $line_tax - wc_round_tax_total( $line_tax ), $this->dp );
+					$this->cart_contents[ $cart_item_key ]['line_subtotal']     = round( $line_subtotal + $line_subtotal_tax - wc_round_tax_total( $line_subtotal_tax ), $this->dp );
+					$this->cart_contents[ $cart_item_key ]['line_tax']          = wc_round_tax_total( $line_tax );
+					$this->cart_contents[ $cart_item_key ]['line_subtotal_tax'] = wc_round_tax_total( $line_subtotal_tax );
+					$this->cart_contents[ $cart_item_key ]['line_tax_data']     = array( 'total' => array_map( 'wc_round_tax_total', $discounted_taxes ), 'subtotal' => array_map( 'wc_round_tax_total', $taxes ) );
+				} else {
+					$this->cart_contents[ $cart_item_key ]['line_total']        = $line_total;
+					$this->cart_contents[ $cart_item_key ]['line_subtotal']     = $line_subtotal;
+					$this->cart_contents[ $cart_item_key ]['line_tax']          = $line_tax;
+					$this->cart_contents[ $cart_item_key ]['line_subtotal_tax'] = $line_subtotal_tax;
+					$this->cart_contents[ $cart_item_key ]['line_tax_data']     = array( 'total' => $discounted_taxes, 'subtotal' => $taxes );
+				}
 			}
 
 			// Only calculate the grand total + shipping if on the cart/checkout
diff --git a/includes/class-wc-form-handler.php b/includes/class-wc-form-handler.php
index e35deb7354d..cd194fc8f5e 100644
--- a/includes/class-wc-form-handler.php
+++ b/includes/class-wc-form-handler.php
@@ -146,7 +146,7 @@ class WC_Form_Handler {
 
 			do_action( 'woocommerce_customer_save_address', $user_id, $load_address );
 
-			wp_safe_redirect( wc_get_page_permalink( 'myaccount' ) );
+			wp_safe_redirect( wc_get_endpoint_url( 'edit-address', '', wc_get_page_permalink( 'myaccount' ) ) );
 			exit;
 		}
 	}
diff --git a/includes/class-wc-geo-ip.php b/includes/class-wc-geo-ip.php
index 1dcfed3c555..fa26a6fe59e 100644
--- a/includes/class-wc-geo-ip.php
+++ b/includes/class-wc-geo-ip.php
@@ -1168,12 +1168,8 @@ class WC_Geo_IP {
 	 * @param string $message
 	 */
 	public static function log( $message ) {
-		if ( ! class_exists( 'WC_Logger' ) ) {
-			include_once( dirname( __FILE__ ) . '/class-wc-logger.php' );
-		}
-
 		if ( empty( self::$log ) ) {
-			self::$log = new WC_Logger();
+			self::$log = wc_get_logger();
 		}
 		self::$log->add( 'geoip', $message );
 	}
diff --git a/includes/class-wc-geolocation.php b/includes/class-wc-geolocation.php
index f22d6f7b9be..5aa3899e70c 100644
--- a/includes/class-wc-geolocation.php
+++ b/includes/class-wc-geolocation.php
@@ -176,7 +176,7 @@ class WC_Geolocation {
 	 * Update geoip database. Adapted from https://wordpress.org/plugins/geoip-detect/.
 	 */
 	public static function update_database() {
-		$logger = new WC_Logger();
+		$logger = wc_get_logger();
 
 		if ( ! is_callable( 'gzopen' ) ) {
 			$logger->add( 'geolocation', 'Server does not support gzopen' );
diff --git a/includes/class-wc-install.php b/includes/class-wc-install.php
index 5bea84ac6bc..04d8cb730f0 100644
--- a/includes/class-wc-install.php
+++ b/includes/class-wc-install.php
@@ -221,7 +221,7 @@ class WC_Install {
 	 */
 	private static function update() {
 		$current_db_version = get_option( 'woocommerce_db_version' );
-		$logger             = new WC_Logger();
+		$logger             = wc_get_logger();
 		$update_queued      = false;
 
 		foreach ( self::$db_updates as $version => $update_callbacks ) {
diff --git a/includes/emails/class-wc-email.php b/includes/emails/class-wc-email.php
index 86bccb1c6cd..da968484645 100644
--- a/includes/emails/class-wc-email.php
+++ b/includes/emails/class-wc-email.php
@@ -411,7 +411,7 @@ class WC_Email extends WC_Settings_API {
 				$emogrifier = new Emogrifier( $content, $css );
 				$content    = $emogrifier->emogrify();
 			} catch ( Exception $e ) {
-				$logger = new WC_Logger();
+				$logger = wc_get_logger();
 				$logger->add( 'emogrifier', $e->getMessage() );
 			}
 		}
diff --git a/includes/gateways/paypal/class-wc-gateway-paypal.php b/includes/gateways/paypal/class-wc-gateway-paypal.php
index 645bff371d1..4b4a9831662 100644
--- a/includes/gateways/paypal/class-wc-gateway-paypal.php
+++ b/includes/gateways/paypal/class-wc-gateway-paypal.php
@@ -79,7 +79,7 @@ class WC_Gateway_Paypal extends WC_Payment_Gateway {
 	public static function log( $message ) {
 		if ( self::$log_enabled ) {
 			if ( empty( self::$log ) ) {
-				self::$log = new WC_Logger();
+				self::$log = wc_get_logger();
 			}
 			self::$log->add( 'paypal', $message );
 		}
diff --git a/includes/wc-core-functions.php b/includes/wc-core-functions.php
index 93fba552936..7823a3c9569 100644
--- a/includes/wc-core-functions.php
+++ b/includes/wc-core-functions.php
@@ -1415,3 +1415,16 @@ function wc_get_rounding_precision() {
 	}
 	return $precision;
 }
+
+/**
+ * Returns a new instance of a WC Logger.
+ * Use woocommerce_logging_class filter to change the logging class.
+ * @return WC_Logger
+ */
+function wc_get_logger() {
+	if ( ! class_exists( 'WC_Logger' ) ) {
+		include_once( dirname( __FILE__ ) . '/class-wc-logger.php' );
+	}
+	$class = apply_filters( 'woocommerce_logging_class', 'WC_Logger' );
+	return new $class;
+}
diff --git a/includes/wc-template-functions.php b/includes/wc-template-functions.php
index c0428a08660..4d7a5396b71 100644
--- a/includes/wc-template-functions.php
+++ b/includes/wc-template-functions.php
@@ -423,7 +423,7 @@ if ( ! function_exists( 'woocommerce_content' ) ) {
 
 			<?php elseif ( ! woocommerce_product_subcategories( array( 'before' => woocommerce_product_loop_start( false ), 'after' => woocommerce_product_loop_end( false ) ) ) ) : ?>
 
-				<?php wc_get_template( 'loop/no-products-found.php' ); ?>
+				<?php do_action( 'woocommerce_no_products_found' ); ?>
 
 			<?php endif;
 
@@ -2305,6 +2305,16 @@ if ( ! function_exists( 'woocommerce_account_edit_account' ) ) {
 	}
 }
 
+if ( ! function_exists( 'wc_no_products_found' ) ) {
+
+	/**
+	 * Show no products found message.
+	 */
+	function wc_no_products_found() {
+		wc_get_template( 'loop/no-products-found.php' );
+	}
+}
+
 
 if ( ! function_exists( 'wc_get_email_order_items' ) ) {
 	/**
diff --git a/includes/wc-template-hooks.php b/includes/wc-template-hooks.php
index 275263824fb..5fff5e0833e 100644
--- a/includes/wc-template-hooks.php
+++ b/includes/wc-template-hooks.php
@@ -74,6 +74,7 @@ add_action( 'woocommerce_archive_description', 'woocommerce_product_archive_desc
  */
 add_action( 'woocommerce_before_shop_loop', 'woocommerce_result_count', 20 );
 add_action( 'woocommerce_before_shop_loop', 'woocommerce_catalog_ordering', 30 );
+add_action( 'woocommerce_no_products_found', 'wc_no_products_found' );
 
 /**
  * Product Loop Items.
diff --git a/readme.txt b/readme.txt
index 39d85ff8e6b..c914239596b 100644
--- a/readme.txt
+++ b/readme.txt
@@ -167,6 +167,7 @@ Yes you can! Join in on our [GitHub repository](http://github.com/woothemes/wooc
 * On multisite, when a user logs into a store with an account on a site, but not the current site, rather than error, add the user to the current site as a customer.
 * Show variable weights/dimensions even when parent values are not set.
 * Automatically sort tax rates rather than allow clunky manual sorting.
+* Made WC_Logger pluggable via wc_get_logger function.
 
 [See changelog for all versions](https://raw.githubusercontent.com/woothemes/woocommerce/master/CHANGELOG.txt).
 
diff --git a/templates/archive-product.php b/templates/archive-product.php
index 0b33281569b..c82c8a10f72 100644
--- a/templates/archive-product.php
+++ b/templates/archive-product.php
@@ -87,7 +87,14 @@ get_header( 'shop' ); ?>
 
 		<?php elseif ( ! woocommerce_product_subcategories( array( 'before' => woocommerce_product_loop_start( false ), 'after' => woocommerce_product_loop_end( false ) ) ) ) : ?>
 
-			<?php wc_get_template( 'loop/no-products-found.php' ); ?>
+			<?php
+				/**
+				 * woocommerce_no_products_found hook.
+				 *
+				 * @hooked wc_no_products_found - 10
+				 */
+				do_action( 'woocommerce_no_products_found' );
+			?>
 
 		<?php endif; ?>
 
diff --git a/tests/unit-tests/util/log.php b/tests/unit-tests/util/log.php
index 152ff08b952..3e77ccf83b4 100644
--- a/tests/unit-tests/util/log.php
+++ b/tests/unit-tests/util/log.php
@@ -16,7 +16,7 @@ class WC_Tests_Log extends WC_Unit_Test_Case {
 	 * @since 2.4
 	 */
 	public function test_add() {
-		$log = new WC_Logger();
+		$log = wc_get_logger();
 
 		$log->add( 'unit-tests', 'this is a message' );
 
@@ -30,7 +30,7 @@ class WC_Tests_Log extends WC_Unit_Test_Case {
 	 * @since 2.4
 	 */
 	public function test_clear() {
-		$log = new WC_Logger();
+		$log = wc_get_logger();
 
 		$log->add( 'unit-tests', 'this is a message' );
 		$log->clear( 'unit-tests' );