Hi, thanks for sharing this issue.
I find it a bit strange that this problem surfaced only in the NCrunch build and not in the Visual Studio one. Is the CodeAnalysisRuleSet option perhaps specified in a platform/configuration-specific section of the project file? I'm glad you've managed to solve the problem, though it would be great to hear if there's anything that could be done from the side of NCrunch to make a situation like this more intuitive.
Cheers,
Remco