I suspect the reason that didn't work is that Crossover only supports 32-bit and Gorgon requires a 64-bit Windows OS at the moment. I got bitten by that myself when I tried using 32-bit wine for Gorgon without actually reading the Windows system requirements...
I know nothing about Macs unfortunately. I suppose you could try a VirtualBox install of Windows or Linux or something like that, but that is going to be rather time-consuming to set up and may not fix your freeze problem if it's caused by some kind of hardware/resource problem on your computer. I assume you are still able to play other games without a problem?