I get this problem very frequently in graphically intense situations. It’s very aggravating to crash over and over again when attempt large group events. I hope this is fixed soon. Here are my system specs:
iMac (27", Mid 2011)
3.4 GHz Intel Core i7
32 GB 133 MHz DDR3
AMD Radeon HD 6970M 2048 MB
OSX 10.10.2 (Yosemite)