Cursor jumps to 0,0 with mouse but it is ok with a pen

[PhilT_GP]

When painting/drawing with a mouse, the cursor jumps towards the top/left corner of the screen when I release the button.

If I use a pen/tablet then this problem does not occur.

Photoshop CC 21.1.0

Windows 10 (1909 / 18363.720)

Tablet is XP-PEN G640S

I still have PS 20.0.8 installed and this DOES NOT show the problem.

I've tried a few things - no change.

Restart Photoshop.

Removed/reconnected mouse.

Mouse is wireless - tried the adaptor in a different USB port.

Removed/reconnected tablet.

Rebooted without tablet.

Removed rulers.

Removed hardware acceleration.

Tried 8/16/32 bit files.

[Grant H]

are you using a laptop? What happens if you disable the touchpad?

[PhilT_GP]

It isn't a laptop. It's a desktop PC with AMD processor and fairly old GPU card.

[Grant H]

have you tried a different mouse? There is a number possibilities it seems (googled: mouse cursor jumps to corner)

[PhilT_GP]

Some progress with advice from another forum ..... Smoothing is linked to this problem.

Smoothing at 0% - I get the problem

Smoothing at >0%, the problem is gone.

BUT: This only applies for the paintbrush.
The Clone /Smudge tools still exhibit the problem - there is no smoothing setting 😞

[PhilT_GP]

I have seen on another forum/adobe page   that this is a known issue in Photoshop.

The recommendation is to go back to version 20.3 but I will stay with 21.x for the moment and set the smoothing to 1%