Can't move the Background layer? That's because back in Photoshop 6.0, Adobe locked the Background layer from movement. That wouldn't be so bad, except that ...
If you're working on grayscale images, you'll find there are some Photoshop filters that won't work (they're grayed out, so you can't access them). Of ...
Problem: You imported an image from your digital camera and although the physical dimensions of the image are rather large, the resolution shows up as ...