Hello djsatane,
My graphics card is a NVidia GeForce 8600 GT.
You can see a screen capture of a tank that does not move at:
http://s1259.photobucket.com/albums/ii546/i00b/
The tank has a yellow circle around it to indicate that it has been selected but the mouse cursor is a red 'X' instead of the mouse cursor that is the animated 4 inward pointing arrow mouse. I have placed a red circle around the mouse cursor that is a red 'X'.
I've been getting a feel for the game and several days to play through a single mission. I have a feeling the length of a mission is related to the tank not moving. I have just noted that the problem of tanks not moving appears to affect mainly the media tank Pzkpfw III Ausf.J. but have found it also occurs with the Sherman.
Thanks