I upgraded this morning even though I already had 2.3 as it said that it needed doing. I did so using fantastico.
Now that I've done so some of my widgets are missing, all my categories and tags dissapeared.
So I uploaded my backup and now I have categories I never made and some of my tags as categories. I can't however make tags after my post any more.
I'm not really sure what's causing this. I turned off all my plugins too, to be on the safe side but still have the issue.
My blog is starry.neo-ilove.com