I'm running Visual Studio 2008 SP1 Standard Edition on a Windows XP Pro machine. I've created a test project as part of an ASP.Net MVC demo. I added one class to the project, which already had two classes. I ran nUnit and the tests were performed. I added another class to the project. This new class will not appear in the nUnit project. It doesn't matter what I do. I can delete the folders in the shadow copy cache. I can change the version of the assembly and rebuild. I can copy the dll to the shadow copy cache. I can disable shadow copy caching. It doesn't matter. These classes will not appear in the nUnit project. This bug renders the product useless after the first run of the test harness. I ran IL Disassembler, and it sees the new classes.