Visual Studio 2012 Not Recognizing Xaml Files, Design View Broken
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Design View for Xaml on Visual Studio Professional RC 2012 used to work for me. But suddenly stopped for no reason I can figure. 

 - Visual Studio 11 No longer Recognizes Xaml Files. 
 - In properties, it treats XAML files like XML.  
 - In solution Explorer it recognizes it as a xaml file 
 - Right Click -> Design View opens a new Xaml *code* page 
 - Controls Toolbox shows nothing   
 - My OS is Windows 7 x64. 
 - I have applied all updates up to July 2012 to VS11 
 - I have tried Repairing Visual Studio & Resetting Settings but to no avail.
 - There is nothing in search or stackoverflow I could find to remedy this. 
 - I have not tried un/reinstalling 

http://stackoverflow.com/questions/10875565/visual-studio-2012-rc-designer-does-not-recognize-xaml-for-a-windows-metro-app looks identical to my case but my problem suggests the issue is more general than his title. 

Reinstalling fixed his issue but does not shed light on this frustrating problem.

Can someone help?

    