I have a problem importing image sequences. I have an image sequence of 300 frames, 1280x720. They are JPEG images with a size of around 40kb per image, 11 MB in total. Usually it gets to around 270 frames telling from the status bar.
Sometimes I've managed to import all 300 frames. I've tried with totally different image sequences too. 100 images and even 200 is most of the time fine.
What could this be about? right now it's stopping me from working. Is Flash really this unstable? This can hardly be a performance issue.
How much RAM do you have?
Try a fresh reboot, don't open any apps except Flash (after windows finishes loading) and try your import.