hi, i got the same problem where the return url is override with the foloowing error:
"The requested URL was not found on this server. The link on the ">referring page seems to be wrong or outdated. Please inform the author of ">that page about the error. If you entered the URL manually please check your spelling and try again."
This is the address i see in the url:
https://www.paypalobjects.com/a2billing ... erinfo.phpim running a2b 1.9 latest version..i can see the payment log is " new" and the payment is not updating on customer account.
Any help much appreciated.
Update:
I have solved this problem. the problem was that my site didn't have https, so had to install the certificate and paypal working fine.