Hi Mike, doesn't seem to have made any difference :/
I replaced that file, reinstalled the PayPal module and again, it has disappeared off of the modules list. In addition, when I try to reach the shopping cart on the front end of the shop, that page is blank as well. Clearly there is an issue with this latest version of the PayPal module. However, I no longer have a copy of the previous version, and i'm afraid the original problem with the error would return if I reverted to the older version.
Is there any way I can speak to your developer? Or would your developer like access to the back end of the shop? I have an extremely frustrated client on my hands.
Thank you!