Recently I’ve been having a weird issue with iTunes where genre’s periodically get converted to numbers in parentheses, such as “(19)”. After wading through some Apple support forums and going through a few different Google searches I stumbled across a post by Doug Adams that described the issue. It wasn’t till I e-mailed him that I found he also had a solution.
So if you’re having problems with iTunes like I was, the short answer is to download it again from Apple. I’m not sure why they didn’t push out the newer build, but my guess is they have another version forthcoming and didn’t want to release them too close to each other.