Hey folks,
I’m getting this same problem now and none of the above seem to work (I also can’t find much on this problem elsewhere). I’m replacing an .mts file with a prores .mov. It’s an 11 minute interview clip and, oddly enough, the first half syncs fine, while the second becomes greyed out and transparent. I tried it with the other two angles, also both mts, in the timeline to similar effect.
Any ideas?