PSE 10 on a Mac has a bug when using the Enhance>Adjust Sharpness option. It will create bands of dark and light streaks across sections of a photo when the radius is set to a specific value (changes with the photo) and the Remove Lens Blur option is used. This is not being reported by PC users. The radius usually has to be set at a value between 1 and 1.4 so far from what I can tell to see the problem occur. Other folks on a photoshop related forum are reporting it too for their photos. It is even more noticeable if you desaturate a photo for a b&w. Then you see "white chunky lines" in sections when you run this sharpness filter. I have not checked it if you don't use Remove Lens Blur but make a dif choice.