I'm loading a .mov video in v4.81. The video loader progress bar gets to 79%, then returns to 20% and climbs again, and keeps skipping back to 20% every time it gets past 79%. At first the loop appeared to be endless, but after letting the video load for a while and coming back later, I discovered it had eventually terminated and the video was in memory. Is this normal? How many times should I expect to have to wait through the loop?