Impossible to use Fullscreen?!

Hi,
I began to play Crossfire 3 days ago. Everything is fine, but somehow the fullscreen option does not work. Even if it's toggled on the gamewindow is windowed, and I can see my Desktop / other running apps.
Is there a way to play in fullscreen?

Information:
OS: Win7 Home Premium x64, Aero Glass off
Resolution (Desktop): 1920x1200 (16:10)
GPU: ATI Radeon HD4870 1g
Driver Version: 10.9

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