Hi,
Thanks for sharing this issue. Based on your example I've been able to quickly reproduce it.
NCrunch is making assumptions about method names based on the rules set down by C#. It isn't possible to create methods containing the period character or spaces in C#. F# makes this possible, and I can see the benefit of this as it allows tests to be named much more concisely.
I'll need to arrange a fix for this, though it may take some time. Is this a blocking issue for you?