To Everyone using Paypal:
Please make sure that you have CB and CBSubs upgraded at latest versions. We cannot give support on old versions, especially for Paypal.
Paypal has made a backwards-incompatible change without notification, nor documentation update, and we have worked around that in CBSubs a few weeks back and notified Paypal of their broken API.
Weeks later, I just got finally a reply from Paypal's technical department that the bug is acknowledged, but without any ETA for a fix yet, so it might be weeks or months until it's fixed Paypal-side. So please upgrade CB AND CBSubs to latest to have the workaround.
While highly unlikely, I'm not excluding other breaking changes Paypal-side, and we are monitoring Paypal notifications on this site too, but in whole last month both IPN and PDT have been working flawlessly (with latest CBSubs). That doesn't mean that there are no Paypal issues in other continents.
So before reporting any Paypal issues, please upgrade to latest CB and CBSubs, and make sure that issue persists. Then, if issue persists, confirm their versions in your post, otherwise please report that latest versions work fine for you.
We usually don't give support on old versions, and in Paypal issues case, won't. See
www.joomlapolis.com/help-us-help-you
Thank you for your understanding.