I'm having the same issue with the game crashing. It only started when I installed Ambitions. At first I thought it was an issue with AM not being compatible with Ambitions. I've since then had one or two patches and several AM updates. Still, no good. My game will not run for more than a minute or two before it crashes to desk top. Sadly, I had to take AM out, every week or so, I put it back in hoping everything has resolved its self. No such luck. My computer has plenty of RAM, disk space, and a great graphics card, so I know it's not an issue with my computer.
   Also, I've tried all three mirrors, so thats not the problem either. Not many people seem to be having this issue, so I'm not sure it's even a AM thing. I've also taken all my CC out, just to make sure that wasn't the issue. It is related to Ambitions, because AM ran fine when I uninstalled Ambitions.
   If anyone figures it out, please let the rest of us know. I'd love to get my AM back.