Thanks for those explanations. It worked great for me!

BUT:
I’m having another problem now. This might be, because I haven’t understood the whole facebook development yet.

Content of a profile box is cached according to http://unfake.it/RA4 until the Canvas page is called again. And it seems to me, there’s only ONE UNIQUE cache?!

e.g.:
I have an app, which gets content from a DB on my host, depending on the fb UID:

SELECT […] FROM […] WHERE uid = $facebook->require_login() […];

User A installed the app, calls the Canvas page and gets HIS content. He than puts the app to his profile, where he can see HIS content in the box. Okay!

Now, user B installed the app, calls the Canvas page and gets HIS content. He than puts the app to his profile, where he can see HIS content. Okay!

BUT: if user B looks at the profile of user A, he also gets the content of himself (user B).

AND: user A also has the content of user B on his profile.

What am I doing wrong?

Is there a way to avoid caching, so that the app on my host is called every time, a profile with a box is visited?

Yes, I have read about fbml.refreshRefUrl(), but that doesn’t work somehow.

Thomas