I've just installed Photoshop CS4. I did a stroke effect for a render and placed it on Overlay and Fill 0%. When I begin to erase certain parts of the stroke, I see a faded version of the render. This is not supposed to be as the only thing that should appear is the stroke.

I never saw this in CS3. The eraser also does not work well on it and erasing is not 1:1. Has the the eraser in CS4 been sort of edited to perform like this? Has anyone else ever had this problem?