Special:Categories does not display categories in use

The Special:Categories page does not show any entries although I am using several categories and they are working fine.

Any idea what might be wrong ?

Regards,

Taco

If you just cleared or built your post cache (or it recently expired), the categories need time to be rebuilt as well.

I only have 4 articles in the wiki at the moment, so I don't think this is the cause ....