The fix that I hoped would work did not,

but I have someone else on the case.
They did find that if you can get in (after deleting the cookies) but can't view the posts, if you click the Printer Friendly link then you can actually see the info in the posts. So if anyone has some info in there they need to see they can at least do that even if they can't post.
I have obtained a new domain name which I hope will just have a knitting/craft forum on it which means I can host it on the server with the database. Therefore I can make up a Brand New Forum but it will be completely empty. More info soon.
In the mean time - what sort of colours do you want it to be? I don't want to use blue as that is for DKY - I am hoping the new forum will be independent of DKY and just be about knitting, not stock etc. Pink is for Craft Bits and Green is for Craft Kits. I will still be admin but then I work for other companies as well as DKY so don't have a problem with being impartial.
The basic colour of this forum type is silver - you can change this forum back to the silver in your profile if you are registered. You will probably recognise it from other forums !
Any suggestions ?