Recently, when I close a source file, VS asks me to 'Save As', even though the file is part of my project. It also happens when I do a refactor in ReSharper or when I build the solution. When I press Save in the Save As dialog box, sometimes it saves and sometimes it says 'Cannot create a file when that file already exists'.
If I turn off NCrunch, the problem goes away.
I had this in the last version of NCrunch too - I updated to 2.23.0.2 to see if it fixed it, but it doesn't.
Any ideas? Unfortunately, I'm not in a situation to post my solution, but it's a C# .NET 4.5.2 solution consisting 7 projects, 2 are shared projects, 1 is a console app, and the others are library projects.