I see this has happened to a few people in the past but i can't find a way to stop it. I've found one or two other questions on this in the forums, but nothing no solution that works for me.
I'm getting the mystery self-creating categories - usually '1' but also sometimes with the many-digit name. Just as at http://en.forums.wordpress.com/topic/new-category-invents-itself-upon-posting?replies=2#post-126056.
I've already tried the suggestions i've found in the forums.
a - I renamed my Uncategorized category to '- just mumbling'. This IS set as my default category,
b - I tried renaming '1' and then deleting it. But as soon as i publish a post, '1' creates itself again.
It's getting irritating. Help!