The minimum fix is to manually repair the TargetFriendlyName setting in the registry (change it to be just "XHTML 1.0 Transitional”) but due to the fact that more settings could be affected the recommended fix is to reset all settings after Beta 2 is installed.
To reset all settings drop down the Tools menu and select Import and Export Settings. This will bring up the Import and Export Settings Wizard as seen below. Choose the last option “Reset all settings” and click Next when ready.
Finally, choose the collection of settings that best fits your development environment and click Finish when done.
Usama wahab khan
Osmani Engg(team lead)
SDET Lead (Visual Studio Web Tools)