I was working on a video when the Program and Source panels went black and wouldn't show anything anymore. The playhead in the timeline also did not move, but I could still hear the audio. I couldn't find a way to fix it and didn't have too much on the video so I restarted Premiere by reopening it while holding Alt+Shift. But this didn't solve anything and the Program, Source, and Playhead are all still frozen, so I can't see any video, but can still hear audio. Any suggestions as to how to fix this? Thanks.