Most likely the theme will need some integration before subcategories will be shown. At present, I believe only vanilla and lavender show subcategories.
Update: firstname.lastname@example.org works with 1.6.1
Publishing a topic can add 10 reputation
Publishing a post can add 5 reputation
Delete a topic can reduce 20 reputation
Delete a post can reduce 10 reputation
How to set
Thanks I'll give it a shot!