Ideally, we'd prevent you from switching channels while painting. Color paint layers are per-channel, they're not global paint values. This is likely why it's breaking for you. I'm not sure why you'd have issues with the paint applying. Are you using SUITE 2.2.1?
I'm painting a bump map and this happens, it's looks more like modern art than a bump map :P This strange effect happens when i paint sometimes but its guaranteed to happen when I undo, and once it's there it doesn't go away either, deleting the layer just makes it worse as well this corrupt look is even affecting my brush…
Let's try this: create a new color paint layer in the Bump channel. Don't switch channels while painting. Do you get the same results or does it work as expected?
here you go https://youtu.be/GyJ2I4f7fUs it happens as soon as I press the paint mask button this time around, and not even reverting the changes can stop it. EDIT: Happens on my work PC as well
That one channel at a time thing only works while your still painting the mask, once you press accept on the mask you have a 50% chance it would work and the other 50% of the time sqaures would pop up. if i don't press accept and switch channel it goes to squares every time like you see above. it's pretty much unusable…