Taxonomy URL - Acces denied

Hi all,

I have a taxonomy group called categories.
In this group I have my categories ;)

In my navigation bar there are a lot of links directed to "site.com/categories/music" (example).

Here's the problem:
I don't have acces anymore to the url; the links in my navigation are gone. :(
I can still see the categories if I go in the admin site .... , I can add and edit them... but no acces to the url :s