Hello,
I´ve mixed several clips from my Virb X, Virb XE, a friends GoPro Session and some recordings from my phone.
This works good, so far. Added some transitions, adjusted the loundness, cutted some clips and enhanced the playbackspeed.
But then, I wanted to cut the first 2-3 seconds from a specific clip. But noting happens, I thought. On the next view I´ve seen the clip before was screwed!
So I removed the cutting (right click), and both clips were restored. I tried it again and saw, when clicking frame by frame, the previous clip was selected, while seeing the frames from the other.
I again selected the right one and the cutting buttons were not clickable.
My solution was to move the clip to the beginning, cut and move it back.
My educated guess is, that the different sources and or the playbackspeed from some clips, screwed that up. The timeline and the internal clip management were out of synch and still are.