Installed Thrones, can no longer run Warhammer.

So I'm sure this solution has already been posted, but I can't figure it out. I picked up Thrones Wednesday, and since then Warhammer has been crashing to desktop at the copyright page. I have a mid 2012 13" Macbook Pro with 8 gigs of RAM, 2.5 gig processor and a whimpy graphics card. I realize the game is not technically supported, but its been running fine on low settings, so Im confused. The crash data says its associated with my graphics driver, but my drivers are up to date. And Thrones runs fine. I've run through the usual trouble shooting (reinstalled, etc.) And could use some help. Thanks.