I hit on this issue as soon as I downloaded and installed the update for 9.0c. But the problem now made me return to 9.0b. (posted in previous post)
Here is the issue. When you put a large jpeg on the time line (mine was 2496x1664) and try to use the event crop to crop the picture, the program will at some point in the crop blank the picture on the time line/preview and disappear? I can actually move the crop in and out and the pic will appear and disappear.
I'm surprised no one else has seen or noticed this, but reverting back to 9.0b seems to fix this issue.
They did something with the pan/crop that I hope they will fix soon.
Ted