At the risk of appearing to be a pain in the rump...
Thanks for the replies, but no solution has yet been found.
I've just spent a fruitless Sunday afternoon trying to get the damn thing to work.
So. In easy steps, I shall explain what I've been doing, and surely somebody can point me in another direction.
1. I write what I wish to post in Microsoft Word, having (in this case) named the page "Olwen-9", and saved it as such.
2. I then "copy" the item.
3. Then I open a "reply" window in "Chit-Chat" ..."Naut str but true".
4. Click on the window to bring up the cursor.
5. Click on "paste". My written text then appears in the window. Great.
6. Click "Post" and the "Forbidden Access" thing appears, and everything else including the Mayhem site just vanishes.
So there has to be some sort of link between the written word that appears before posting, and the bit in the Mayhem server that says, basically, "sod-off". And that's getting right up my facial protuberance. Platitudes, commiserations, sympathy and all that guff are nice to read, but they don't solve the dilemma/problem.
Just this once more I'll waste some of my allotted 3 score and 10 to type in the next one.....but let's get a solution,eh? BY.