Missing categories problem with Wordpress 2.6

So, loads of people are having issues with this as per a search or two on the Wordpress forums, and I found myself in the same boat. Check it out - I found a fix

I inserted the wp_categories table from my backups and then ran the sql query I found here:

update wp_term_taxonomy, wp_categories set description = cat_name where term_id = cat_ID;
update wp_terms, wp_categories set name = cat_name, slug = category_nicename where term_id = cat_ID;