Visual Studio 2013.1 won't load projects

When trying to launch the .sln built by the GenerateProjectFiles.bat Visual Studio starts up and says it does not support the projects. Has anyone else been able to launch the project with VS2013.1? Do I need to rollback to before the update?

Unsupported This version of Visual
Studio is unable to open the following
projects. The project types may not be
installed or this version of Visual
Studio may not support them. For more
information on enabling these project
types or otherwise migrating your
assets, please see the details in the
“Migration Report” displayed after
clicking OK.

  • UE4, “E:\Development\UnrealEngine\Engine\Intermediate\ProjectFiles\UE4.vcxproj”
  • BlankProgram, “E:\Development\UnrealEngine\Engine\Intermediate\ProjectFiles\BlankProgram.vcxproj”
  • CrashReportClient, “E:\Development\UnrealEngine\Engine\Intermediate\ProjectFiles\CrashReportClient.vcxproj”
  • MinidumpDiagnostics, “E:\Development\UnrealEngine\Engine\Intermediate\ProjectFiles\MinidumpDiagnostics.vcxproj”
  • UnrealLaunchDaemon, “E:\Development\UnrealEngine\Engine\Intermediate\ProjectFiles\UnrealLaunchDaemon.vcxproj”
  • ShaderCompileWorker, “E:\Development\UnrealEngine\Engine\Intermediate\ProjectFiles\ShaderCompileWorker.vcxproj”
  • SlateViewer, “E:\Development\UnrealEngine\Engine\Intermediate\ProjectFiles\SlateViewer.vcxproj”
  • SymbolDebugger, “E:\Development\UnrealEngine\Engine\Intermediate\ProjectFiles\SymbolDebugger.vcxproj”
  • UnrealFileServer, “E:\Development\UnrealEngine\Engine\Intermediate\ProjectFiles\UnrealFileServer.vcxproj”
  • UnrealFrontend, “E:\Development\UnrealEngine\Engine\Intermediate\ProjectFiles\UnrealFrontend.vcxproj”
  • UnrealHeaderTool, “E:\Development\UnrealEngine\Engine\Intermediate\ProjectFiles\UnrealHeaderTool.vcxproj”
  • UnrealLightmass, “E:\Development\UnrealEngine\Engine\Intermediate\ProjectFiles\UnrealLightmass.vcxproj”
  • UnrealPak, “E:\Development\UnrealEngine\Engine\Intermediate\ProjectFiles\UnrealPak.vcxproj”

It seems a restart of my computer fixed the issue. I think VS had cached some bad project files or something.