[OpenIndiana-discuss] How to straighten out an /etc/passwd /etc/opasswd mess I've created

[hput]

Messing around beyond my capabilities I've managed to create a
situation where I cannot add a user:

 useradd  -m reader
UX: useradd: ERROR: Inconsistent password files.  See pwconv(8).

Running `pwconv' seems not to do a thing.

I've jerked around with the files  so much this morning I doubt I could really
recount all I've tried. (/etc/passwd /etc/opasswd /etc/group /etc/ogroup)

I know at one point I renamed /etc/passwd to see is pwconv would
rebuld it... no such thing.

This is oi just updated, running in a vboxvm and even though it
wouldn't be a disaster to just reinstall... I have done a fair bit of
work getting it ready before I became idiotised.

Is there some way to fix this short of reinstall?