With eStore 4.1.2 and eMember, with at least one item in the cart, click the 'Check Out With PayPal' button.
You get a blank page, URL:
http://imgigclub.com/WP/wp-content/plugins/wp-cart-for-digital-products/eStore_payment_submission.php
Disable eStore 4.1.2, enable eStore 3.6.5 - problem resolved. Click 'Check Out' and you get to a PayPal screen.
No debug files or errors are generated when this problem occurs. Here are the headers from the button press:
POST /WP/wp-content/plugins/wp-cart-for-digital-products/eStore_payment_submission.php HTTP/1.1
Host: imgigclub.com
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Referer: http://imgigclub.com/join
Cookie: wordpress_a3af1be1111556004edd5e7b1ed1077a=IMGIGClub%7C1282549386%7C81f7a28c5bac90894378cc51953fbcbb; wp-settings-1=editor%3Dhtml%26hidetb%3D1%26m2%3Do%26align%3Dright; wp-settings-time-1=1282409051; wordpress_test_cookie=WP+Cookie+check; wordpress_logged_in_a3af1be1111556004edd5e7b1ed1077a=xxYYzz%7C1282549386%7C99a05b4dbf961a16c2e81b68a192e934; __utma=255125136.438036620.1281496721.1282376717.1282386443.7; __utmz=255125136.1282324048.5.2.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=site:imgigclub.com; __utmc=255125136; PHPSESSID=xxYYzzb8dcb0edc6e3af0d316664572; wordpress_test_cookie=WP+Cookie+check; wordpress_logged_in_a3af1be111155600xxYYzz1ed1077a=IMGIGClub%7C1282549386%7C99xxYYzz961a16c2e81b68a192e934; cart_in_use=true; logintheme=cpanel; cprelogin=no; cpsession=gL_QtJHnLec_ez0ecZLexEbmgeFAioZPkrF_0gRsKvUDAeAc4g4krTM8iYuAMsVb
Content-Type: application/x-www-form-urlencoded
Content-Length: 142
eStore_gateway=paypal&eStore_url=http%3A%2F%2Fimgigclub.com%2FWP%2Fwp-content%2Fplugins%2Fwp-cart-for-digital-products&submit.x=34&submit.y=15
HTTP/1.1 302 Moved Temporarily
Date: Sat, 21 Aug 2010 17:23:19 GMT
Server: Apache mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635
X-Powered-By: PHP/5.2.13
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Length: 0
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html
