Are you sure about only needing clippers for windowed mode? If you get rid of the clipper and display a pic that's falls even a little off the screen in fullscreen, none the pic is displayed (IME). With a clipper, the pic is displayed clipped to the screen edge :?. I tried changing the example code so that the monster pic is displayed with a right of "SCREEN_WIDTH + 25 instead of SCREEN_WIDTH - 25 - i.e., a little off the screen. It only displayed when I attached a clipper. Hmm.

Thanks for the simpler method of adding clippers - I'll add that to the tutorial when I get home.