iTunes for OS X does not support Full Screen visuals...yet. I'm guessing you guys didn't read your Read Me's.
The buttons across the bottom are, from left to right:
REPEAT / REPEAT 1 (one click, two clicks)
You can also play by GENRE, as well as by artist or album. You can shuffle within these, shuffle your entire librabry, or shuffle within playlists you've created.
Death to the Desktop!
450MHz G4 Cube, 320MB RAM, 20GB Drive / DVD / Firewire CDRW
Mac OS X 10.1.4 / Classic 9.2.2
SONY 17" Trinitron, Pro Speakers, Keyboard, Mouse