My IT department just pulled the plug on all things Quicktime for the windows machines. Most of the ProRes files still play back fine in AE and PPro. However, there are certain ones that only play the audio. The video track is not showing up. I can play them back with Scratch player so I know the files are good. I cannot figure out what the difference is between certain ProRes files that makes some play and some not. The Mac's have no issues. And I didn't have any issues before the QT drivers were removed.