Using latest Photoshop 2021 update. Having problem with masking. If I create solid colour overlay, then use paintbrush on the mask layer to erase some of the solid colour, it starts off ok but if I lift off and start in a new place then the brush switches to a halfway point of erasing and resinstating the solid colour.
Using Mac Big Sur 40Gb Ram i7 processor with all of the latest updates. Any ideas?