Unfortunately Resharper has a long history of breaking MBUnit support with every new release. I noticed version 6.1 has been released, but I can't use it until it works properly with MBUnit.
So, does Resharper still work with MBUnit? I'd try it myself, but last time I did I lost all of my Resharper settings while downgrading, so I thought I'd better ask first this time.
Thanks,
Adrian