Gamecenter stopped working

Backtothis

So Gamecenter was working... until a couple builds ago where for whatever reason the Gamecenter log in button no longer worked on ad hoc. The button itself works - if you add a delete actor to it upon touch, it does that. But Gamecenter no longer tries to log in. We went back to an old build that used to work, but Gamecenter no longer worked on that anymore either. So as of right now no Gamecenter functions are working. What might've caused GC to suddenly stop working? We're using the same provisioning profile as before and on the same phones. Everything else works, iAP works, just not GC.

Backtothis

Ok we made a new app that has one actor, and that one actor has one behavior which is to login to GC on being pressed. Even that isn't working. Could GS thinking I am not on a pro account anymore be a problem? Literally nothing has been changed that is related to GS or generating the IPA since the version that had a working GameCenter. As stated, we are even using the same prov profile.