Quote Originally Posted by 4thwave View Post
Thank you so much for the post!!!

I disabled SSU and lo and behold Paypal return url resolves correctly.

So, something is wrong in the install. Should I uninstall the old version before installing the new one???

A
You dont have to, just upload the new install, make sure you read the documentation come with it carefully. After upgrading (I would suggest 3.5.7 if you have php5), if you still have problem please follow this:
http://wiki.rubikintegration.com/zen...ngs/paypal_ipn

PS: also try the change I suggested earlier as well.