I do think that I have hit upon an issue.  The WINS data for samba is kept in /var/cache/samba.dat but it is updated dynamically with nmdb.  It has dated data.  When I moved the server I changed the server name slightly and so the WINS data points to the old name at the current IP.  In fact with this network rebuild I changed most of my computer names and they are all incorrect.  I think I need to shut down all three instances of samba clear the wins data and then start them all again so that they populate from scratch.