hm, sounds really weird....
its not the mac book pro, as those have a real video card. maybe its the system version? I don´t have mountain lion so I can´t look into that.
The best chance you might have in getting this to run is, deinstalling everything and than creating a completely new bottle with WinXP.
Than you have to try the whole thing step by step. That means, first install just the game and nothing else. Try running this. If that works, progressively install the fan-patches, high-res patch (which didn´t work that well with me - so you might have to be careful with this one). Try running the game after each sperate installation, so you can narrow the error down.
Also don´t forget to put the -doublebuffer -no3d tag in the "run" command. If you want to know how that works, step by step, click here:
https://www.codeweavers.com/compatibility/browse/name/?app_id=4196;forum=1;msg=126862
Avarchillion