[Yuli Sees]

I had the same problem and it seems that it was due to a corrupted project file. Even when I was simply saving the project as a new one without changing anything, the file size was shifting from 20Mb to 700Mb, with no effects or nothing complicated (5 minutes video). I created a new project and imported the old project (or you can only import the sequence that you need) and that solved the issue. Massive relief – I hope it helps.