Color Replacer Freezes Photoshop 26.11.0 Windows 11

Using 26.11.0 on Windows 11, Geforce RTX 4070.

The first time I open an image and use color replacer, it works. I can change colours from, say, red to blue by either typing in a number or using the slider. When I try doing the same on another image, it freezes completely and I have to close the program using Task Manager. Opening Photoshop again, I can occassionally edit again, but more often than not the problem will occur repeatedly until I reboot the PC.

I have read posts where this happened on a mac 5 years ago. I don't have Rulers enabled, I've turned off Multithreading, tried resetting as Photoshop starts and I've tried moving the window away from the image window. Nothing helps.

Thanks

Darren