I posted this question on the video-copilot site and it was rejected with the reasoning. 'Spam in all it's glory' So I'm guessing this is a pretty basic issue that a lot of people have, although I've not found the answer for it anywhere.
When I apply two masks to a layer, it cancels the one out. Then if you invert one of them, the other one starts working. I can't seem to get both of them working at the same time.
Any help here would be greatly appreciated,