@teloz – it’s actually a brand new blog and database with an import of the old articles and comments. Hence your old account not working. The user name thing is a bit annoying in that is doesn’t tell you it’s got to be lower case, etc., I’ll see if I can make the instructions more explicit.
I keep a weekly backup of the blog, but there doens’t seem to be an easy way of backing up the forums. Bah!