Photoshop 27.5: Lower Wacom pen side switch set to right-click triggers a false RAM error with the Remove Tool

After updating to Photoshop 27.5, I had to switch from WinTab to Windows Ink, because WinTab no longer works correctly in my setup.

Since then I have found what looks like a bug involving the Remove Tool, the healing/plaster icon with the AI stars.

When using the Remove Tool, Photoshop sometimes immediately, and sometimes only after several uses, shows an error saying that there is not enough RAM available.

This does not seem to be an actual memory problem.

Key finding from testing

The issue appears to depend on the Wacom pen side switch assignment:

• Lower pen side switch = Right Click → the RAM error occurs

• Lower pen side switch disabled → the error disappears

• Upper pen side switch = Right Click → currently works

• Mouse input instead of pen → no error

So the issue seems specifically related to the lower Wacom pen side switch when assigned to right-click, together with the Remove Tool.

What I already tested

• Started Photoshop with fresh default preferences → the error still returned

• Disabled GPU support for testing → the error still returned

• GPU compatibility check in Photoshop → all OK

• System info → no obvious RAM or GPU problem

• Scratch disks → plenty of free space, well over 1 TB

• Mouse input works normally

• The issue appears only with pen input

• Remove Tool Processing under Image Processing is already set to “More stable”

My setup

• Photoshop 27.5.0 (Photoshop 2026)

• Windows 11 25H2

• NVIDIA RTX 4090 (latest Studio Driver)

• Wacom Intuos Pro (PTH-860 / PTH-660) with Pro Pen 2

• Wacom driver 6.4.12-3

• 96 GB RAM

• Windows Ink enabled

To me, this looks like a false RAM error caused by the interaction between Photoshop 27.5, Windows Ink, and the lower Wacom pen side switch set to right-click while using the Remove Tool.

Has anyone else seen this?