Note to self: don't forget to run this command:

"%ProgramFiles%\Microsoft Visual Studio 9.0\Common7\IDE\vsdiag_regwcf.exe" -u

when getting the annoying error popup in VisualStudio:

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Microsoft Visual Studio
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Unable to automatically debug 'Xyz'. The remote procedure could not be debugged. This usually indicates that debugging has not been enabled on the server. See help for more information.
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OK   Help  
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I recently started using VirtualBox as a replacement for VirtualPC 2007 to do builds using an old build environment. The NUnit test was failing, so I fixed the problem, compiled, and reran the test. Hmmm, still failing! Retried a couple of times, and then it hit me! NUnit didn't see the changed binaries when in VirtualBox. So I restarted NUnit, and presto! Tests are running again! Now I hope I won't forget next time...