No need to multiply topics when you already have created one, especialy to create a new one with an undescriptive title as "help".
In the how do I FAQ there's an item listed in the section "Facebook".
acebook highscore list - LINK
Have you followed the discussion there ? Does it bring any new informations ?
The discussion follows here.
I haven't messed with facebook so far, so I can't say really much.
The facebook API seems very unstable and it sounds like you have to carefuly "craft" your code.