WordPress MU

I'm having a weird problem. There's a "1" (as in just the number 1 and nothing else) category on all blogs. If I delete it, it just comes back. What is it? It's annoying and ugly...

Anyone else having this problem?

Running latest MU btw.

I have exactly the same problem but on main blog only.

I'm not seeing it on two fresh installs.

I can't check to see the name of the tables but can you open up the database and check the database tables associated with the categories tables for both the blog and the sitewide categories to see what is occuring within the tables as well? Sorry I can't give the names as I can't pull up anything from here.

I have that problem on my main blog. I noticed that one of my users also has the problem: http://books.bitfreedom.com/

Maybe it's problem with Windows live writer?

When I post from WLW without assigning category, it assigns "1" category automatically.

I don't use WLW, and this started happening on my blog after I did an import the first time. The other blog it happens on uses XML-RPC. So who knows, maybe it has something to do with some code expecting a category field and not finding one.

Same problem here as well with new 1.3 install.

Go into your wp-admin > Options > Writing and change the Default Category from 1 to something else. Problem should be solved.

Is there way to set it for all users?