I just updated to the latest (2.2.14) version. Before I did so, I created a /root/ispconfig/isp/conf/customized_templates directory and I copied my (functional, customized) pri.domain.master template file into it. Then I ran the upgrade.
My zone files apparently did not get rebuilt as they still have dates as of the previous upgrade and they look fine. I then modified a domain and it was rebuilt properly using my customized template.
So, my problem looks like it's fixed.
Thanks again for this great product!
p.s. Some time ago, I put up a quickie howto on my web site for my own benefit. Maybe someone else might find it useful. http://www.sonoracomm.com/index.php?...rdering=newest