I have no idea what is wrong. I'm using Vegas Pro 15 to create multi angle videos. I used 3 camera angles. One of the angles was MTS while the other two were MP4. I created and rendered the video just fine. Only weird thing was it said I could rename the files in my project to Cam1, 2 ect. So I did but it renamed my source files too!! (I'm wondering if this did something weird to the program.and might be the source of the problem) Anyway. I wanted to make another 3 cam mix video and now whenever I load up a MP4 video the picture is moving like its in fast forward. The audio is fine put the picture is just flying by. What did I do wrong? Is there a fix for this? I'm ready to move on to another program as customer support is non existent with Vegas Pro.