After I had posted my original, Dave, I tried to put the same posting in the other forums which hadn’t got posts but when I hit ‘Submit’, all I got was a blank input box with a system reply saying something like, ‘There are no postings in this forum’.
Having failed in my efforts, I did an ‘Edit’ to my first posting to explain what had happened but when I hit ‘Save’ or ‘Submit’ or whatever, my original posting reappeared with no changes whatsoever.
Strange, passing strange!
I shall now go and try again to put an ‘Initial post’ in a forum that as yet has no postings. You will see the success or lack of when you next access the forums.