This is one. What was seeing is two locations where a home page can be set.
Under Tools>Settings there was one fill-in and under Vivaldi:\settings was a different screen where Home page could be set or turn the home button on. In fact the settings to turn on the home button was nowhere to be found.
In the end I did a reset of the default settings and rebuilt my preferences. That seems to have cured it for now.
I don't want to label this thread as "solved" because it is still somewhat ambiguous as to what the real issue. For now I'm functional again.