Strange OpenDKIM error

Not sure what changed here but suddenly OpenDKIM won't read my key 
files.  The error is:

   key data is not secure: opendkim is in group 0 which has multiple 
users (e.g., "darcy")

Of course I am in the wheel group or else I couldn't become root.  What 
I don't understand is, why does it think that opendkim is in group 0.

   # id opendkim
   uid=104(opendkim) gid=104(opendkim) groups=104(opendkim)

I upgraded from 14.0 to 14.1 but that was about a week ago.  I upgraded 
to newly built packages around the same time.  This only started today 
at 13:42:26.

I have turned off DKIM signing for now but obviously I can't leave it 
that way.  Too many places reject unsigned emails.  Can anyone help me 
debug this issue?

Cheers.

-- 
D'Arcy J.M. Cain <darcy@druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 788 2246     (DoD#0082)    (eNTP)   |  what's for dinner.
IM: darcy@Vex.Net, VoIP: sip:darcy@druid.net