Project Preview stays blank
Project Preview stays blank when trying to play a project with video and audio (sample reproduction steps: download sample_iTunes.mov from https://support.apple.com/en-us/HT201549, throw it into timeline, play your project). I've been able to get an output when playing video only .mov file, but it turned blank when trying to rewind. Basically Project Preview is not functional right now (at least on OS X).