Sorry, I should have been more specific. I'm using the "Easy" one-click install. I don't want to have to maintain/upgrade the installation
I think I found the problem. It looks like the DNS took a lot longer to propagate than I expected (seemingly over 24 hours?). It is working now.
There's a quirk in the user interface for the "Easy" install. It defaults to something like: "wiki.example.com". When you change to to "www.example.com", it will report that it successfully installed to "example.com". Dropping the "www".
After 24 hours, "www.example.com" works fine. But because of the messages in the panel, and the time for the DNS to propagate, it looks like it never worked.
Thanks for the feedback and the help.