Visual Studio Go to MetaData Open Definition

In my website project. From the .aspx.cs file, when trying to navigate to the UserControl definition on the same website, Visual Studio 2012 opens MetaData instead of navigating to the original file.

It worked and stopped suddenly.

I tried:

• Cleaning and restoration
• Deleting the .suo file
• Create a new solution and re-add the website project.
• Resetting all settings in VS
• Reinstalling Visual Studio and Reusing Update 5
• Deleting ASP.net Temp Files
• Removing temporary files in AppData li>

This worked until today when it just stopped navigating to the original file. Any suggestions?

Update: Our test environment also demonstrates the same issue. This leads me to suspect that this caused a Windows update. However, I uninstalled all updates applied in the last 5 days and the problem persists.

Update: VS seems to compile the aspx.cs and ascx.cs files into a DLL. This is not intended behavior.

Update: My other website projects are doing the same thing, so at least this is not a project specific issue.