Have you found any way to fix the issue? I have wasted 2 days now with the same problem (loosing my project twice), and it takes a step further after a few attempts. Every clip below what I try to split becomes white in the timeline, and there is no sound/picture
in the preview window from about 2 mins before where I attempted to split to the end of the videos. If this happens to anyone else, my advice is to close the program, don't let it save your work; or when you close and try to reopen it, the entire timeline
will be white and show a black picture and no sound when trying to play the preview. I have tried uninstalling essentials, rebooting, then reinstalling, but the problem persists. I have been looking for other free video editing software, but everyone seems
to think WMM is the best; so I am open to any fixes that will make this program actually work.