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I found a solution, but it's an annoying solution:
VLC player has a conversion utility built in. I converted the MOV files to MP4 files in VLC. Now they work just fine.
Is there a way to get PD17 to handle MOV files natively?
There isn't an issue with MOV files in general, but PD clearly has a problem with your specific clips. It's very strange that you can preview them with audio in the media library, yet there isn't even an audio track when you place it on the timeline.
Conversion via VLC or another free app like Handbrake or VirtualDub2 is certainly an option, but if you can share a short sample by uploading it to a cloud folder and pasting the link here, we'll be able to examine it and test it on our systems.
It would also help if you could please follow the steps listed in the Read Me Before Posting sticky thread and run the DxDiag test. Attach the results here, along with a screenshot of PD's version screen as well.