Hi, Ben
I just tried this on test installation of 16.3.6830 and it's displaying fine in the domains list and in the domain details when you Manage the domain:
Domains List:
Manage nanny.domain.com:
Are you running any translation for the SmarterMail interface? Is this how you were setting things up? I even tried a rename of a domain and it displayed just fine..."nan" was "nan". (NaN was NaN, etc.)
Derek Curtis
COO
SmarterTools Inc.
www.smartertools.com