I have found that they use the new OPENGL 2.0 system for AE7, and it freaked my AE up totally. Until that I took of the switch I had turned on “DLL defrag…” in Memory/Ramcache.
Now it runs stable. It might be because the AE7 is made for very new GFcards.
In the manual it says that this option should be turned of it you experience crashes.. dont know if you have it on, but it helped for me.