Hi there. It happened to me several times. While working with the brush if you change to the hand tool PS will freeze.
You''ll be able to highlight other tools but the pointer will show always the hand tool, and you'll only be able to move the photo.
Quitting Photoshop won't be enough. You'll have to restart the computer. PS CS5, Mac OSX 10.6.3.
Am I the only one experimenting this bug?
Thanks, Carlo