OS X Update

-Fixed issue which prevented extra missions appearing for some users.

-Workaround for performance issues provided for users with Nvidia graphics cards running OS X 10.10.5;

Currently separate drivers are available to fix performance issues specifically affecting Nvidia users who are using OS X Yosemite. These drivers are currently only compatible with OS X Yosemite 10.10.5 and can be found here http://www.nvidia.com/download/driverResults.aspx/89538/en-us