Upgrading

Hi everyone,

I just upgraded from 2.3.3 to 2.6 For some reason my category names deleted themselves. I have all the post ect… and it shows that I have categories in the admin. However, they are blank – No names! odd,,, I was wondering if someone could help me out. I ran this upgrade on a test site so I’m looking to fix this problem before I run it on my Blog.