I seem to be having this problem too, but with AE CS 5.5 and 3D Invigorator Pro. Symptoms are the same: registration details don’t hold and I’ve had AE lock up on me.
The AE freeze I think is memory related since it only happened once when I ran out of RAM while working, and since then I’ve been careful not to use all my memory and I haven’t had is freeze again (knock on wood).
Chris Larsen
My Fault Productions