I am using Movie Maker (build 16.4.3508.0205) on a Windows 8.1 PC (64 bit, 8Gb RAM) trying to publish a movie made from MTS files. I have done this dozens of times on this PC with this version of Movie MAker, but now, all of a sudden, it no longer allows me to make movies of any significant length. When I try, the progress bar "hangs" several times when climbing towards 100% (freezes at 42%, for example, for a good 10 minutes while it normally takes 10 seconds per percentage point). When it gets to 99%, it fails saying that one of the clips is no longer part of the project (and a yellow, triangular warning sign appears over that clip).