[PyMOL] G5 and pymol flashing

[William Scott]

Hi folks:

I bought a new G5 fairly recently.  When using pymol, the screen goes 
white for brief instances when rotating a molecule, giving rise to a 
flashing effect that is so off-putting it keeps me from using pymol on 
this machine.

I have a 20" monitor and the following video card:

PCI/AGP Cards:

    GeForce 6800 Ultra:

      Type: display
      Bus: AGP
      Slot: SLOT-1
      VRAM (Total): 256 MB
      Vendor: nVIDIA (0x10de)
      Device ID: 0x0040
      Revision ID: 0x00a1
      ROM Revision: 2119

        NVDA,Display-A:

          Type: display
          Display Type: LCD
          VRAM (In Use): 256 MB

It was a $450 upgrade from the default card.

I am running the latest MacPyMOL version.

Is there anything that can be done about this?  Is the graphics card 
defective?  The same pymol works perfectly fine on my old G4 laptop.

Thanks.

Bill