Hi All, I've been doing some testing and it appears that despite appearances to the contrary, the forum IS working....kind of. For most operations you will get to see what you should be seeing if you refresh your screen at least twice...sometimes 3 or 4 times. In other words, if you post a new topic, or reply to an existing one, you won't see the new content straightaway as you'd expect, but if you refresh the topic page, or the main forum listing you will eventually see the new content.
This is incredibly annoying because you only know to do that if you've posted something yourself - i.e. how do you know what you should be seeing unless you know it should be there?
Incidentally, this method also resolves the problem of being given the wrong identity. Keep refreshing and you will eventually end up back as yourself (although this doesn't work 100% of the time in every screen).
I'm going off to Google these symptoms and see if anything reveals itself.