Screen goes grey when I change brush size?

[Archie5E55]

Hi I am using an updated Photoshop 2021 on Windows 10. Whenever I try to adjust my brush size (alt+right click) the image I am working on goes totally gray until I am done adjusting my brush size. I reformatted my computer recently and reinstalled photoshop and it has been doing that since I reinstalled it. Thank you.

[AxelMatt]

In a first step I would reset the Photoshop preferences.

https://helpx.adobe.com/photoshop/using/preferences.html#reset_preferences

If this doesn't help please deactivate the GPU support.

Troubleshoot Photoshop graphics processor (GPU) and graphics driver issues (adobe.com)

[Trevor.Dennis · Accepted solution]

The Alt right click and drag brush sizee and hardness feature requires GPU acceleration to be turned on, so if you are having an issue with it, it _might_ be to do with your video card driver, or probably more likely, it is yet another glitch with tools and features that use the GPU that have plagued us for the last three updates.

Can you tie the start of this issue with when you last updated Photoshop?

What is the image mode and bit depth?
Does this happen with all images or just the one?

When exactly does the image become greyscale? i.e. when you hit the Alt key, or when you hold down Alt and right click? Or not till you move the mouse?

[Archie5E55]

For some reason the issue resolved itself and is no longer happening anymore. Thank you for your response though I appreciate your time.

[Sami38]

thanks for detailed responce much appreciated