webforms - Visual Studio 2012 hangs when opening site.master -

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i using visual studio 2012 ultimate 11.0.60315.01 update 2 under windows 7 pro. have been doing non visual development while no issues. have created fresh web forms application. go open site.master in "design view" in html editor vs freezes.

the freee results in me being unable click elsewhere in ide (menu's, solution explorer) etc. not if ide has hung, rather has stopped responding. same behaviour evident if run devenv.exe /safemode. cpu usage minimal , have plenty of ram available.

any suggestions on how diagnose , resolve issue?

running vs administrator seems alleviate problem.


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