I have no idea how to even approach debugging this issue. I have a solution with four projects in it and all of a sudden it has stopped functioning properly.

When I open the solution and click on anything, it freezes up and it says that **'Visual Studio is busy waiting for an internal operation to complete"**. It gives the same message when I try to build the project, although it never actually opens the file or builds - I have to end the process in order to escape.