A while back there was a bug reported on "rulers blatting canvas" using
the NVidia libraries on Quadro cards where the black cursor lines did
not get erased. No solution has apparently been reported.
The problem seems to be in the OpenGL "flipping" option which only
applies to Quadro cards.
This can be turned off by running the "nvidia-settings" interface and
unchecking the "Allow Flipping" option.
Borlan
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