Flight Video issues...any ideas?

I need a little help or insight. I finally started diving into FSX this morning. To get started, I decided to record a flight video so that I could play with various display settings. The video was simple: take-off, fly over a densely populated area, and fly back to the airport for a landing. Trying to execute on that plan was difficult. I ran into to problems.In the first attempt, the flight went really well; however, when I watched the playback, my C172 started sliding sideways on the tarmack and eventually flipped over. Any idea what could cause this problem?Given that the first video was unusable, I tried it again. In the second attempt, the video played back well; however, when I looked at an external view, the camera shook violently. It bounced up and down and forward and back. I am running a nVideo 6600GT with up-to-date drivers. I have not experienced this problem during normal (non-video) flight and did not notice it in Tower or VC mode. Is anybody else having this problem? Any ideas how to solve it?Thanks for any insight in advance.Bob