I now realise I am just talking to myself. So, perhaps I have to accept that Yetanotherforum is an excellent product when installed from new, but does not upgrade very well.
I spent too many hours now on a site that I can no longer use Yetanotherforum. I have uninstalled, and reinstalled, to find that whenever I click anything on the forum page, it takes me straight back to home page. There is no option for me to do anything any more.
Oh well, it was good while it lasted.
I hope a forum moderator can read this whole topic and just delete it.
I have think I can not continue with these forums unless I just stick to one version forever.
Thanks for ride.. pity it was never for long!