Looks like KB2670838 might be a bit of a pain. It seems to be messing with some systems, including causing a strange colour change in Revit 2012 as per Color Change in Revit 2012 after Updating Windows 7 – The Revit Clinic
The update seems to be related DirectX, including Direct3D. You can read more about it at:
A platform update is available for Windows 7 SP1 and Windows Server 2008 R2 SP1
Windows Update sometimes becomes quite an annoyance doesn’t it? I previously posted about problems with WDDM1.1 and Graphics Adapter WDDM1.2.
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