Cinema 20 and Samsung T240HD problem

I have a Apple Cinema Display 20 and a Samsung T240HD connected to my G4 MDD Dual 1.25. The Cinema is connected to the ADC connector and the Samsung to the DVI connector of a Radeon 9000 Pro Graphics card. The Samsung is connected via a DVI to DVI cable. The Samsung was a plug and play installation and connects at 1920 x 1200, as it should. All works well and looks good except about 50 percent of the time when a dragged window spans both monitors the Samsung goes completely black until the dragged window is completely on one monitor or the other. Is this a driver issue or a hardware problem with the Samsung? Any suggestions appreciated.

As a troubleshooting measure, it would be interesting to set the primary monitor to the opposite of however it is set now, e.g. if the menu bar is atop the Cinema, move it to the Samsung. Then see if either the problem goes away or if the Cinema starts going black instead under the described circumstance.
Just from the sounds of it, I am guessing a driver issue. It's hard to imagine how this could be a problem with a display, though it can't be ruled out for certain. Ideal would be if you could beg or borrow a 23" Cinema and substitute it for the Samsung for a while and see if the problem is in the 23" as well. That would call out the problem being somewhere with the Mac for sure.

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