Only use rm=2 for paypal when SSL is enabled, to avoid security warnings when returning to the site.

classes/gateways/class-wc-paypal.php

@@ -208,7 +208,7 @@ class WC_Paypal extends WC_Payment_Gateway {
 				'no_note' 				=> 1,
 				'currency_code' 		=> get_woocommerce_currency(),
 				'charset' 				=> 'UTF-8',
-				'rm' 					=> 2,
+				'rm' 					=> is_ssl() ? 2 : 1,
 				'upload' 				=> 1,
 				'return' 				=> $this->get_return_url( $order ),
 				'cancel_return'			=> $order->get_cancel_order_url(),

readme.txt

@@ -153,6 +153,7 @@ Yes you can! Join in on our [GitHub repository](http://github.com/woothemes/wooc
 * Tweak - Allow more readable flat rate options to be entered
 * Tweak - Changed category and tag link to filter product list in admin panel
 * Tweak - Removed product 'exists' variable in favour of the exists() method. Tweaked exist method to look for ID in DB.
+* Tweak - Only use rm=2 for paypal when SSL is enabled, to avoid security warnings when returning to the site.
 * Fix - Replacing use of deprecated function get_current_theme() with wp_get_theme()
 * Fix - Body classes now correct for WordPress themes with non alphanumeric characters
 * Fix - PayPal http_build_query & -> & on some PHP 5.3 servers