Well, no, my game don't uses any multisampling effects, and there's no Motion Blur.
The scripting mode is not activated, so there's no python.
EDIT: <font color=green>Problem resolved !</font>
The problem was with the "Eye Distance (3d)", I don't why, but the value was changed. The value was 0 instead of 500...
Stange, so I've restored the value to 500 and <img src="smileys/smiley32.gif" border="0" align="middle" />
Thanks for the help anyway.