Comment 5 for bug 520941

WORKAROUND:
After identifying the clips in which the bug appears, just add another timeline/track and move these clips to the new track.
I found out, that if one clip glitches almost all others on the same track does it also.

The bug probably appears mostly on full-packed tracks.

After sorting and moving some clips I got my project bug-free. It runs on 7 tracks now (had 4 at first).
But I am happy not to loose all the work.