Photo Booth is freezing after Maverick upgrade. Any help?

Photo Booth has been freezing since I upgraded to Maverick yesterday. On my MacBook Pro, it shut it down. On my iMac, it did the same thing. Once I did manage to get it up again on the iMac, I got a spinning ball in less than 30 seconds, and then it just crashed.

On the MacBook Pro Retina Display, it crashes immediately — and, even then, the screen in Photo Booth is completely blacked out.

Any ideas?

Thanks