I just had the oddest "crash".
Somewhere in a 4-player (3x AI) the game just froze. I checked the task manager and it was at around 1.7gb used.
The thing that was odd however was that I could not kill the app, it did not show as (Not Responding), it was just frozen.
On my other screen I could happily do whatever other things like watch a movie or whatever, but the game itself was non-responsive.
I'd attach the crash report, but I can't seem to attach anything to posts.
On the memory limit:
Please please consider also building the executables/dll's as 64bit. It's 2012... the few cavemen still using 32bit PC/OS can then just use the 32bit version while the 99% of customers that did go along with the times will not have those silly memory crashes. Thanks.