Screen saver won't stay activated

When I activate my Screensaver with a screensaver activation button or key combo; at the top of the minute; plus 2 seconds; some process runs and kills the screen saver.

Went to Console and found :

argument '-psn_0_7997344' not understood ScreenSaverEngine[77253] 6/24/11 4:26:41 AM

if thats a clue? What else could be cause my screen saver to deactivate?

Thanks