Fullscreen GUI issue in IE10 + MonkeyQuest.

Repro Steps:

1. Launch IE10 without WebPlayer installed
2. head to monkeyquest.com
3. Login / signup and install WebPlayer when prompted
4. Once in game enter fullscreen
5. Observe GUI is re-positioned to top left area instead of stretching out.

Desired outcome: GUI to correctly switch to fullscreen mode

Actual outcome: GUI fails to switch and remains in a windowed resolution even with the game in fullscreen mode.

Not reproducible with UberStrike on Facebook.