I reinstalled MEP17, created a project, dragged and dropped a mp4 to the time line. I cannot move the clip on the timeline. I add another clip, it does not end up next to the previous clip, but somewhere else, I'm trying to put the clips end to end for now. I've never had this problem before. Using win7 64 bit prof. Is there a setting I missed?
MEP 17! That's an oldie! It is Movie Edit Pro 17 you're talking about, not Movie Studio 17?
If MEP 17, it is a long time ago for me and I don't have it installed but you haven't locked the track after you brought the first MP4 in, have you? I can't recall if there is one, but there may be a "track lock" button on the far left end of the track.