I've been experiencing this problem for over a month now. One day my video preview just disappeared. Audio played during ram preview but the video was all black. However, today I finally realized the dumb reason why I wasn't seeing any video! I hope this solves your problem as well... In the preview panel it says "include" and there are a few icons: a speaker icon, an eye, etc. The eye icon wasn't selected! That's why nothing was showing up. I must have accidentally un-clicked it. Make sure it's selected on your end. Good luck!
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