I would like to report, that I've just ecountered the very same issue described in this thread while running on FreeNAS-9.2.1.5-RELEASE-x64 (80c1d35). I've tried using 'No stat' option on my only AFP share (for Time Machine) and it doesnt change anything - as soon as I turn AFP service on, I am getting 'Connection error' while trying to browse the device's shares via Finder (that are CIFS based).
That's really an issue, because either I have shares, either Time Machine backups...