Visual Studio 2012 Not Recognizing Xaml Files, Design View Broken

Question

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 Re

Answer 1

Suggestion 4 in this link worked for me: devenv /resetuserdata in Command Prompt.

So at least in my case, re-installing and then the above command cleared all issues. It is possible that resetting user data could have made it unnecessary to re-install but I can't know that now.

I still can't say what caused this but it seems a pretty long tail issue that occurs sporadically and looks to have precursors in older versions.