"According to numerous posts on Apple's discussion forums (several threads of which have been deleted by Apple), as well as a number of popular video editing blogs, Apple's recent QT 7.4 update does more than just enable iTunes video rentals — it also disables Adobe's professional After Effects video editing software. Attempting to render video files after the update results in a DRM permissions error. Unfortunately, it is not possible to roll back to a previous version of QT without doing a full OSX reinstall. Previous QT updates have also been known to have severe issues with pro video editing apps."
