I saw many topics of people encountering the same problem I had. My problem was caused by starting a portable version of photoshop on a computer with premiere installed (not portable): when closing photoshop, it deletes ALL files from /13 folder (default premiere folder). The problem is still present in last versions but since happened to me, I save project outside default folder (on desktop for example), and also do backup on external hd. Can't believe advanced softwares like this always have this problem, or problems like rendered clips disappearing (becoming red again) with no reason.
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