Screen artifacts when expanding window

Anyone seen this and know the cause? When I drag the window larger I get the view below. I am not sure if it is a Photoshop issue or a system resource issue. 2.93 quad core Macpro 8GB Ram.

Actually that is hardly a solution, just a narrowing down of possible causes, because with OpenGL turned off you lose functionality for several features (Rotate View Tool for example).
You might try to update the driver for your graphic display card or see if changing the Advanced Settings (to Basic for example) can alleviate the problem, too.

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