I have a solution that I still run in VS 2010. After opening the solution in VS2010 after install of Visual Studio 11 I noticed that the navigation bar is missing.
The strange thing is that it is visible in some of the projects in the solution. This is indepedant of language. It seems like new projects always have a working navigation bar.
I tried to go into settings and uncheck and then go back and check navigation bar. Did not help.
Any ideas?
Tools -> Options -> Text Editor -> [Your Language] and make sure the the “Navigation bar” checkbox is selected. MSDN