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Re: CS4 Bug, does anyone else get this?
Just kind of guessing here but...Photoshop CS4 leverages the graphics display card's GPU, instead of the computer's main processor to speed its screen redraw. For Photoshop to access the GPU, your display card must contain a GPU that supports OpenGL and has enough RAM to support Photoshop functions. Try this: Go to Edit > Preferences > Performance (for Windows) or Photoshop > Preferences > Performance (for the Mac) and uncheck "Enable Open GL Drawing". If that solves the problem you may want to update your display driver to one compatible with CS4.