I think the error is not related to InstelliSense. The log shows the Telerik VSExtensions (responsible for the Telerik Project Wizards) crashing. To fix it I recommend fully cleaning Visual Studio 2012 of the extensions before reinstalling them:
- Uninstall all Telerik extensions from Visual Studio 2012 | Tools | Extensions and Updates
- Ensure all Visual Studio instances are closed.
- Delete all direct subfolders of C:\Users\[username]\AppData\Local\Microsoft\VisualStudio\11.0\Extensions\ containing Telerik.*.dll assemblies.
- Reinstall them fron Extensions and Updates menu.
IntelliSense not working with Visual Studio 2012 is a known issue. The following article suggests how to fix it (use asp:ScriptManager instead of telerik:RadScriptManager):
Let me know If you need further assistance.
All the best,
the Telerik team
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