The problem is that no one can log in. If I'm logged into Fusion, I ought to be able be logged into PhotoPost simultaneously, but I'm not. And I can't login using PP's login script using my Fusion username and password.
I can't resync the groups until I can login, though it's probably not the biggest problem at the moment. The cookies are set site wide.
Basicly, what I did to change the integration from threads to fusion was in the PhotoPost control panel. I left PhotoPost in the database it was in before and Fusion is in it's own database. I doubt they have to be in the same database, or do they?