Many thanks for those suggestions. @robinintexas – yes, I think there must have been a configuration problem at the hosting site, or with Softaculous handling a subdomain. I tried adjusting the WordPress Address and Site address as you suggested and got the same errors. @salmanbaig0312 – I tried that – removed the WordPress installation completely and installed manually using cPanel to create the database and FTP to load the code. You were right – not a big issue – and it seems to have worked.
So I’m left with the conclusion it was either Softaculous or hosting settings – at least the problem is now solved. I guess the moral of the story is do it manually!
Thanks for you contributions.