Video (VLC and Quicktime) lags when other monitor is turned off

I have a mac mini running 10.6.1 with a dual monitor setup (mini dvi to dvi, and mini displayport to dvi). When i have a video running in either vlc or quicktime on one of the monitors and i turn the other monitor off, the video begins to lag every 3 seconds.
Any ideas what i could do to fix this?

Apparently something was up with my monitor connection. It was pushed in all the way, but when i took it out and put it back in the problem was fixed.

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