Brush circle curser partially missing

[belcamp george]

When I go to use the brush, somtimes the circle that defines where the brush will apply a stroke , is missing. It idisplays only half, or less, of the circle. In all the years that I have used photoshop, I have nevers seen this. I have the very latest version of Photoshop. Any suggestons?

[Peru Bob]

Try resetting the tools and/or preferences.
To restore preferences quickly using a keyboard shortcut:

Press and hold Alt+Control+Shift (Windows) or Option+Command+Shift (Mac OS) as you start Photoshop. You are prompted to delete the current settings. The new preferences files are created the next time you start Photoshop.
Note: Using the keyboard shortcut, preference files for custom shortcuts, workspaces, and color settings will also be reset to default.

from here:

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

[Bojan Živković]

If the above suggestion does not work then it could be a problem with the GPU unit. Are your drivers up to date?