Hi Jonzy, the way you describe the issue sounds fairly logical to me, but still I didn't see any correlation with undoing a couple of times, since I utmost rarely do that. I keep working ahead instead of backwards, so that's why. On the other hand you might be well right, I don't doubt your experiences. According to my experiences, it does not matter if you are on Win 7, 8.1 or 10 or Mac OSX, Adobe CC2015 or CC2017 in all different versions, even hardware like MacBook Pro, MacPro 2011, iMac2012, MacPro 2013, HP Z640, HP Z820, HP Z840 or PC-Clone doesn't matter, the bug always shows up at the very moment (deadline calling!) you cannot use it at all. Jonzy schrieb I found that if I cut and paste back the Lumetri setting in the effect panel makes this behavior stop for a short while. Sorry, here I completely must disagree with you. "Stopping this behaviour for a short while" is just not good enough for professional people like us, you and me. I tried that method dozens of times and it never worked for me. Only cutting the whole segment out and pasting it into a fresh sequence, Lumetri-ing it there. Then cut and paste that very same segment back again into the master sequence worked for me. Annoying, highly irritating, but survivable. Bye.
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