I've had several occasions when I have both Dreamweaver and Photoshop CS5 running, where Photoshop's brush tool will not show results after applying the brush tool. This is especially true when using the brush tool on a layer mask. In order to see brush strokes, I usually have to turn off/on the layer to see what I just did. If I quit Dreamweaver during this process, the brush returns to normal. What is up?