I'm having troubles with Photo Booth on Lion. Everytime I try to record a video, it records for 3-5 seconds then quits right away. It was also my first time using the record button on my 13" Macbook Pro i5.
Did you install any additional effects or backgrounds, or perhaps migrated from an older Mac? I think any such add-ons would be in your /Library/Compilations folder.
Nope, I haven't done any modification on it, taking pictures is fine, just record makes it shut down. Update; I just tried it again and it works now. weird..