I am playing a game that's called Bookworm on the Mac, and it runs in full screen mode.
If I press ⇧ shift+⌘ cmd+4 to capture part of the screen, it won't work. Usually, I can press space and click to capture the whole window, but that doesn't work, either.
⇧ shift+⌘ cmd+3 works to capture the whole screen, but I'd like to find out how to take a partial screenshot.