Hi Molly,
I'm not aware of any issues with IPN currently, it sounds like the issue is being caused by the way the POST is being parsed or handled.
Are you not getting the IPN POSTs at all? Assuming your script is supposed to update your database, are you seeing any entries or nothing at all? What do your server access and error logs show?
I went to your site and put in a test order. When I look at the code your cart is sending to us, it looks like they are trying to send all of the items ordered in one item name, which can get truncated since there is a 127 character limit. I'm not too familiar with the different modules for ZenCart, so I am not sure if there is a module that will let you upload the individual item information. For more information on passing individual item information, please visit
https://www.paypal.com/cgi-bin/websc...side#methodtwo