ZC 1.3.7.1
Module: Paypal IPN

Followed all instructions, everything was working fine until recently:

1. Payment accepted, but order showed up in Admin area after a while.
2. No confirmation email sent to customers
3. Order shown as unpaid

This problem has been reported by several other users. I suspect that somehow Paypal doesn't send back the info to the handler. Any suggestion for debugging this would be really appreciated.