Known issues with MS August’s security update
Microsoft is investigating behavior in which fonts do not render correctly after any of 2982791, 2970228, 2975719, or 2975331 updates is installed. Microsoft is also investigating behavior in which systems may crash with a 0x50 Stop error message (bugcheck) after any of the above updates are installed.
Microsoft has removed the download links to these updates while these issues are being investigated.
Read more here - http://support.microsoft.com/kb/2982791