Photoshop CS6: Redraw Glitch

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  • Updated 6 years ago
  • (Edited)
I have Photoshop CS6 and I was working at 50% zoom. At first, when I went to 100% zoom, it deleted random parts of different layers and even when I zoomed back out they were still missing. It just showed the transparent pixels. Even undoing my last actions wouldn't bring the missing parts back, so I know it wasn't something that I accidentally did on my own.
After that incident, I redid everything and now whenever I apply an image effect (blur, etc) or change the layer mode, random blocks of color will appear and cover my work.
The only way I've been able to work around it is to do one action (example- duplicate a layer), then save and close Photoshop completely before re-opening it and doing one more action (ex- change layer mode) before saving/closing/etc.
I'm working on a MacBook Pro.
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Jessica Johnson

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Posted 6 years ago

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Chris Cox

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You seeing bugs in your video card driver.

For Windows, you need to update your video card driver from the GPU maker's website.

If you're on MacOS, then you may need to disable automatic graphics switching (which incorrectly switches between the low power and high power GPUs in your machine). If that doesn't solve it, then we need more details to file another bug with Apple about their drivers.
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Chris Cox

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If you get redraw glitches like that after disabling the GPU - then you have more fundamental problems with your system. It could be a bad OS install, but the most likely cause is still bad hardware.

The only time people are seeing redraw problems like this is with bad video card drivers, defective GPUs, defective RAM, and sometimes defective CPUs.
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Jessica Johnson

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Other than Apple's diagnostics tests, what would be another way to test for the issue? I've tried everything I can think of and the issue only occurs with Photoshop.
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Jessica Johnson

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Should I download a trial version of another type of graphics software and try to duplicate the issue in the new program? Because that would definitely show if the problem lies within Photoshop or my computer, would it not?
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Chris Cox

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Not necessarily, because another program may not use the display APIs or the GPU in the same way. But testing something else that uses the GPU may show similar problems, like a 3D game. Corel Painter might come close in it's use of basic drawing APIs.

And we get lots of reports of "this only happens with Photoshop", which boil down to defective hardware and Photoshop is the only app they're using that stresses the system enough to show the problem. And in every case the problem goes away when the defective hardware is replaced. Sadly some less educated repair people refuse to believe that such things can happen and rely on incomplete diagnostics instead of actual logic or hardware testing.
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Jessica Johnson

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I more or less duplicated my exact actions (using the same base photo) in Corel Painter 12, plus added a few more effects, and the redraw glitch didn't appear. Someone suggested having my computer stripped and then reinstalling the OS, so I'll most likely try that but I need to back everything up first.