PC user here, and 7.4.1 did *not* fix the issue in AE for me. I opened up an older AE CS2 file w several pieces of QT footage, but could not even scrub past these segments of the comp without AE freezing up. Eventually the death grip released, but I was only able to fix the problem fully by deleting the QT segments.
I did uninstall and put in 7.3 and now I can work with the comp again, tho this isnt an accurate test since I havent brought all the footage back. But I think it could also be an AE CS3 thing in conjunction w QT.
All in all, I hope Apple and Adobe dont start going to the darkside and prematurely releasing these new versions just to please their marketing department, and forgetting about thorough testing and development. Hate to see the “service pack” mentality infect these 2 companies, even tho it seems pretty ubiquitous in the software industry as a whole.
3d Artist
http://www.ituran.net/3d.htm