Behrooz Roozbeh, you’re really not giving us much info to help you. I assume version 2 of Zbrush, have you tried the steps that were successful in various posts above???
To be specific, please list the steps you have done and the order you did them so we can hopefully narrow down the issue. There are no guarantees, as everytime Apple updated the OS things sometimes got better, sometimes not so much.
Aurick has done many people a nice favour with his post above.
However if you are running 3.1 under VMFusionWare, you should be doing pretty well as you have a far more powerful system than my first generation Intel MacBookPro.
timaging, did you not report success in an earlier post??? Fill us in if so and what has transpired since. If you were not successful, fill us in.
Will try to help, even though I haven’t been around in sometime - sorry I get very savant like when on big projects.