Glitches on external monitor on new MacBook (video)

I am seeing graphical glitches appearing on the 2nd screen hooked to my aluminum MacBook (late 2008) through Apple's mini DisplayPort to DVI adapter. Dancing pixels, of a sort.
They are not there initially, but appear after an hour or two of use.
Unplugging and re-plugging the screen into the MacBook clears the issue...for a while...
The monitor in question is an Apple Cinema Display with an ADC connector, going through and Apple DVI to ADC converter before getting to the mini DisplayPort to DVI adapter. It's a lot of adapters, but it should not be a problem. And the glitches were never seen when this external screen was (until recently) used with my MacBook Pro rev 1.
See a poor-quality video of the glitches here:
http://gallery.me.com/blakespot#100108
Is anyone else experiencing this? Thanks.
blakespot

Interesting. I found that putting the MacBook to sleep and then waking it causes the problem to go away (for a while). I use the MacBook 5 days a week for a full work-day and it happens at least once every day.
I am using the MacBook with an Apple Cinema Display 20-inch (plastic)...
http://www.flickr.com/photos/blakespot/2968210374/in/set-72157608229267141/
...and the refresh rate selector in Sys Prefs is disabled. I assume the MacBook know what the display is capable of and is feeding at that rate (probably 60Hz).
blakespot
Message was edited by: blakespot

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