Comment 30 for bug 520941

I saw something strange.
I had some glitch in the begining of a fade.
Upper layer(track) = track1
Lower track = track2
Fading from Track 1 to Track 2

Track1 ==================
Fading \/ \/ \/ \/
Track2 X=============

the single frame you know about was at point X.

When i moved the track 2 to an point earlier like

==================
                                  \/ \/ \/ \/
             X=============

this single frame flashes again at point X.

So track 1 was playing but every time when a clip starts below, the first frame of this clip flashes up for one frame.