All of a sudden i can paint in the brush preview, but cant paint in a layer at all. I have two layers background is white and foreground layer is transparent. If i fill the transparent layer and paint it erases the layer I'm on. the eraser and the brush have the same effect...I have to press e and 5 let go and it starts to paint... if I change brushes I have to press E and 5 all over again. I am Really confused and frustrated. With a mouse or with my tablet. it dosn't matter. Heeeelllllp.