Use faceforward
Working fine here with the same setup. Try uninstalling both app and tweak, then reinstall both?
There was--but Facebook disabled the use of the iphone app on the iPad. Download FaceForward in Cydia--this fixes the block FB put on the app and gives you access to the not yet released iPad version. It's free.
Or do what I do 90% of the time--use Safari. There's a few things you still can't do, but mostly it looks better than the app does, at least to me.