Yep, there is a shift issue bug in PD9. I found out what caused it, so I've been working around it, but it slows me down in the projects. Here's what happens: let's say you have a bunch of video tracks in the video timeline, and you unlink a few of them and delete the audio portion, so that now you just have the videos there. If you then try to take those video clips and move them around in the timeline, it shifts ALL the rest of the video clips off their audio tracks without unlinking them. So I have to go back to each video track, unlink each one, align them, link each one, etc.