Hi and thanks for checking out my issue!
I've been wokring on a project editing together about 40-different clips that are about half MP4 and half .MOV files. All of the sudden my .MOV files are just black in the preview monitor. I've tried reinstalling Vegas, updating QuickTime, and also unchecking the option in preferences>video that says something like close media when other apps are open.
I really hope someone can help me with this. I'm unable to work on my project until I get this figured out. Thanks so much!