I’m hoping this isn’t a technical question. I have gotten fairly proficient at Windows Movie Maker with importing and editing family home movies. One issue that happens and I don’t know why, is at times when I return to a unfinished project, all my previous editing is replaced with nothing but triangles with exclamation marks on them on all of the clips. That’s throughout the whole project and nothing is there/or plays!  Most recently, I put my work on flash drives and tested it to make sure that don’t happen again. I tried to open project on tower with no luck. (Nothing but those triangles) I tried the flash drives. (Same) I tried flash drives on 2 different laptops and got the same thing. Hours of work wasted???

Any answers/ideas? Thanks: Mike McCauley