BUG FIX:
We found a bug that was causing some people's game not to start, and we've fixed it.
This fix may also help anyone who is having framerate dropping issues.
To get the Fix, uninstall and reinstall the game, or follow the link below for a direct install of the missing DirectX information.
https://www.microsoft.com/en-us/download/details.aspx?id=8109