Mouse cursor stays on screen

[mbp]

Running on a macbook pro.

When I launch the game the mouse cursor stays in the middle of the screen.

The ingame mouse icon moves no problem, but the macosx icon wont go away.

Different resolutions don't help the problem. Native 1920x1200 or lowest settings.

I altered the settings.cfg to allow windowed mode and the cursor will only go away after tabbing out of the program and back in... But playing in windowed mode is awful, no immersion and worse than playing with a cursor stuck in the middle of the screen.

Any ideas?