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I've never run into that issue myself with Photoshop CS6 or Photoshop CC but I've only ever used it on NVIDIA GPUs.

Have you tried increasing the memory allocated to your Intel iGPU in the BIOS, or seeing if a driver upgrade/downgrade helps at all?

The only longstanding quirk with GreycShop is how it can rarely cause portions of the image to become semi-transparent, so you should always remember to 'lock transparent pixels' on the layer before filtering.