Facebook apps auth_token problem?

[Remora the Random]

Almost every app--both games and quizzes--I've tried to open for the past week has had this weird error where it starts loading the app page but before anything comes up, it adds ?auth_token(bunch of random letters and numbers that change) after the last slash. I've tried a bunch of apps and it seems the only ones that work are Flair, Farmville and Vampire Wars. I logged off and into a family member's account and there were no app problems at all. Is there a reason or solution for this?

Thanks in advance

Oh, and I use Firefox