Comments stop working

Hi,
I been using the articles comments and always works fine,
but from the  
last day just stop working. You can submit your comment with
the  
comment form, but  dont show it in the Admin Comment area to
approved,  
and don't save it in the Data Base. The templates are ok, 
and no  
changes has made recently. What can be? I using Campsite
2.6.7

Thanks.