I've discovered that after I 1) experience the bug, 2) save my changes, 3) close the project, 4) reopen the project, 5) everything seems fine and I can edit a clip, 6) then when I move on to a new clip the bug comes back. In other words, imagine I have the clip FLOWER.MP4 right next to BEACH.MP4.... well, I can fix the bug and edit FLOWER, but when I went to BEACH, the bug came back, and I had to close the project and open it again. Ugh.
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