I am trying to use W3 Total Cache for my site (http://www.mediatribune.de) but am running into issues with an e-Commerce-Plugin ("Dippsy", see: http://dippsy.cz.cc or http://wordpress.org/extend/plugins/dippsy) we use to process so called "PREMIUM Content".
If I place an order while W3 Total Cache is active, the PayPal-IPN-process doesn't work; after buying, the customer should receive an email with a download-link to his / her product. This mail however is never sent out if W3 is running in the background. I tried excluding the plugin-directory with the page cache (wp-content/plugins/dippsy/* & wp-content/dippsy/*) but that doesn't work...
Anybody have similar issues? Can I somehow setup that the IPN-information is not cached or similar?
Sadly, I didn't get any suport from the plugin-author @ Dippsy...
Help is greatly appreciated!
Thanks in advance.