Hello! my brush was working great...then for some reason now when I go in to paint over my gaussian blur mask, it doesn't do anything. It won't select the pixels. I have no idea what I did...help !

Is the layer locked?

no - it isn't locked

Can you link to a screenshot of your layers pallete? You won't be able to actually put the link into the post (since you're new) but you can do something like this:

www . imagehostname . com / imagepath . jpg

We'll be able to decipher that and find the pic.

I'm not quite sure what you mean