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;