[Forrest]

I've had a similar issue, but only when:
1. I'm using OW and then switch to another application
2. OW stops responding, then begins to respond again
3. I click on the icon in the dock, but usually that doesn't work
4. I use expose and that brings the windows to the front

Yesterday when that happened my entire system locked up. The clocked stopped, everything but my mouse froze. I let it sit for 15 minutes and nothing changed. I think that's the first time this system has locked up since I got it in September.