AFAIK, the last official release (1.8) has problems with NVFS devices. (It was released before the first NVFS device became available.) You might want to try the
CVS snapshot. The CVS log shows that fixes for NVFS devices have been implemented since the last release. I can't vouch for its stability, though, as I don't have an NVFS device myself.
It's about time the Plucker folks released a new stable version. Is nobody interested in it anymore?