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Pope1402555

: Weird Photoshop screen update problem when doing "Step Backwards" with a tablet When I have my tablet plugged in, "Step Backwards" and "Undo" stop functioning normally. I have CS5 Extended 12.1

@Pope1402555

Posted in: #AdobePhotoshop #DrawingTablet

When I have my tablet plugged in, "Step Backwards" and "Undo" stop functioning normally. I have CS5 Extended 12.1 64-bit and OS X 10.7.3 with a Wacom Intuos PTZ-630.

Suppose I draw 3 discrete strokes with the stylus. If I hit "Step Backwards", I would expect the most recent stroke to immediately disappear. But it doesn't. However, as soon as I do anything (such as press the stylus tip to start drawing again), the stroke disappears! If I hit "Step Backwards" again, that stroke and the preceding stroke seem to disappear simultaneously.

Clicking & dragging the window for the image "counts" in terms of causing a screen update. So if I hit "Step Backwards", nothing will happen, but then as soon as I move the window even one pixel by clicking & dragging the top bar, it will take effect.

Hitting "F" to go into full-screen mode makes the problem go away. Both full-screen modes (there's one when you hit "F" the first time, and another when you hit it again) fix it.

Anyone experienced an issue like this?

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@Hamm6457569

The most likely source is an unforeseen interaction between the GPU driver and the tablet driver, since it's a screen refresh issue.

The problem might be caused by Photoshop's GPU usage. The extra load placed on it by the pen input might be triggering the defect. Try each of your GPU acceleration settings (Advanced, Normal, Basic) in turn to see if there's one that makes the problem go away. The setting is at Preferences > Performance. Click on the "Advanced" tab to find it. You'll have to quit and restart Photoshop each time, to make the change effective.

If that doesn't fix the problem, trash your preferences (hold Cmd, Opt and Shift while the program is loading) and try again.

If that STILL doesn't fix the problem, report it as a bug to Apple and Adobe.

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