When you asked about my resolution I was like, "Hmmm what will happen if I attempt to run the game on my extended desktop (1680x1050)?" I set that monitor to my primary screen and ran the game. It works! Works great, exactly as intended - BOTH 'Quit' and 'Fullscreen' buttons work! So I think, "It's gotta be my (1920x1200) monitor's fault." I switch back to test again on the troubled monitor! And it works fine! :: visible confusion :: I just want to apologize. Definitely a workstation issue. Not sure which configuration settings change when swapping primary monitors but that was the key. Just switching back and forth fixed it. Sorry for sending us on a wild goose chase!