Clips restarting

Hello,
I don't have much of a problem, it's rather a minor annoyance. Whenever a clip ends, it restarts at the beginning. I don't remember what I checked (or unchecked) in the user preferences to enable this, but I'd sure like to put a stop to it! I'm using FCP 4.5.

I think you're referring to Loop Playback. Turn it off in View - Loop Playback, or CONTROL-L.