The Problem
Not only can I not use Moles see this post I can't get rid of them either (much like my backyard). I'm sure I'm missing something [not] obvious [to me]. I see I'm not the only person having this issue.
The Symptom
After removing the moles config file (in the project dir I think, don't remember the name) and removing references to the mscorlib moles/behaviors I rebuild and the references are added back. I also removed the MolesAssemblies directory though a link below says that bug was fixed.
Misc links
I found an older reference to removing the MolesAssemblies directory (which I tried) but that was fixed a long time ago.
I also found this detailed suggestion for removing moles at home, but it didn't work either ;)