All kidding aside, this seems to be a real security issue. Your system shouldn't be showing unauthorized users what you were doing. It should properly flush the memory.
I do have a movie clip showing a session where root was viewing the /etc/shadow file. The shadow is displayed on the screen for about 5 seconds before the KDM login pops up. Ask if you want to actually SEE this in action just ask and I'll mail it to ya.
Does a power off flush it?
I have power cycled at least one of the machines and let it sit for several minutes. Also as I stated before sometimes when I get up in the morning I catch glimpses of stuff I viewed just prior to shutting the machine down for the night.
Several folks have mentioned it could be related to the ram chips on the video card.
-KF
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