thanks for your help.
But the settings mentioned in the link you´ve posted were already made by default. So i tried to switch back to the non default. But non of them worked for me :/
Mediacache flushing didn´t change anything :/
PS: It´s CS 5.5
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When you've stabilized your shot render it before closing AE. That will solve most every warp stabilizer project. The AEP get's bloated with stabilization data and it could overwhelm your system.
I figured out that the easiest way is to replace the original footage with itselfs.
This however helps to reactivate the composition and enables to render it out, without analyzing the footage again.
Thanks to everyone helping me!