Supporters not granted supporter status after paypal payment.

I’ve been getting some complaints from users that are signing up for supporter status that after they pay they do not become supporters.

I logged into my paypal account and see these people indeed did pay via paypal but when I log into their account they are not granted supporter rights and I have to manually extend them.

I just did a test run and I had the same problem as them. Basically I went through the payment process. I paid, and then returned to my site. When I returned back it was like I never even signed up. I checked my paypal account and the funds were indeed in the account but supporter status wasn’t turned on.

I just updated to WPMU 2.9.1 and the latest version of Supporter. I’m wondering if perhaps it’s an API issue..

Any ideas?