I have since two days trouble with a normal login/oauth(orization) via a facebook application.
It behaves as like the app never left Sandbox Mode (which is disabled): Login Fails for (alot/some/not all) normal users however there's no problem for the page admins, developers etc. to authorize.
There's an error at the oauth page of facebook, not very helpful: "An error occurred. Please try again later."
I made a stupid test app, that really does not much:
It really seems like the error is caused by facebook, but it is hard to find someone else with this problem online. So I'd like to ask:
Thanks alot, Lasse
(the German errror message for search the engines: "Es ist ein Fehler aufgetreten. Bitte versuche es später noch einmal.")
This question is very dated now. The answer is: Facebook made something wrong. The same code worked on another app created some time later (I don't even remember how much later) but never worked on that app, AFAIK. So it was just a broken app on facebook side.