Should mention the rise in reports that http://forum.unity3d.com/threads/172759-Unity-4-0-1f2-and-avast-8-0-1482-quot-getThreadContextfailed-quot-error/page5 A/V version 1489 is causing users to get this error. (could it be related to a policy change?) Just wanted to provide more info. Not sure if it helps but its worth informing you guys about it.