This problem concern many players, a full solution is presented here :

If it's not enough, like for me (old sys = low framerate + a widescreen) one poor solution worked for me after trying everything : play windowed in 4/3..

A patch is announced end of november, maybe it'll fournish a real solution.

A full solution is presented here :

If it's not enough, (like for me: old sys = low framerate + a widescreen), play windowed in 4/3.

A patch is coming at the end of november, maybe it'll provide a real solution.