I have an ASP.NET MVC4 application solution (.sln). When I close Visual Studio and then reopen it and my solution, my tabs and my navigation structure in the solution explor
As far as I know the .suo-File
saves which files are opened. Try to delete this file (VS will generate it new) and make sure that windows-file-permissions are set correct (read, write access).
Perhaps you can try the Workspace Reloader plugin that Scott Hanselman blogged about?
http://www.hanselman.com/blog/IntroducingWorkspaceReloaderAVisualStudioAddInToSaveYourOpenFilesAcrossProjectReloads.aspx
You can install it from here - http://visualstudiogallery.msdn.microsoft.com/6705affd-ca37-4445-9693-f3d680c92f38
I had the same problem with Visual Studio 2013, and I solved it by doing this: