I have zen cart 1.3.8 running here, http://www.ccowaterfowl.com/store2. Until recently everything has been working fine, and now clicking the checkout button goes to a blank screen.

To get it to get to that point I also had to disable 2 products. Prior to those two products being disabled adding an item to the shopping cart or viewing the shopping cart would cause the same problem.

I followed instructions I found here on the forum to make zen cart show the php error messages, and there are none that seem relevant, or at least they show up on every page, not just pages that don't work for whatever reason.

Any help would be greatly appreciated.