Snort Rules empty ?

[T5000]

Hi,

I have enabled snort (free subscription) and selected various categories. Now when i check Rules->Category->select Rule from drop down, some categories are empty:

snort_attack-responses.rules - empty
snort_bad-traffic.rules - empty
snort_ddos.rules -  empty

in fact all snort rules are empty… only the emerging rules show something.

What's going on there ? is that normal ?