Vegas 15 build 147, I believe. Windows 10 with an HP i5 with 16GB RAM. I have been editing a music video with five PIP windows. As four of the five windows were shot with a cell phone I had them arranged across the middle of the screen with our logo in the background. I created an MP4 and all seemed fine. Our music director wanted me to tweak some volumes in the last 30 seconds of the video. When I opened the .vf project file I found 3 of the 5 PIPs moved and resized. I went back to earlier saves and all of the PIPs are identically moved and resized - as if something changed with the program itself. Since each track is spliced multiple times to synchronize the timing between all five singers I would have to reposition these PIPs hundreds of times, which is just not practical. Do I have to start all over or is there some way to move all of the sections of the PIP track simultaneously? It would help to know what "broke" that the PIPs throughout every save changed, or what changed in the program that it is interpreting the positioning differently after the rending to an .MP4.