Anyone seeing URIBL_BLOCKED?

[Mark London]

Hi - Around 7PM yesterday (US eastern time), I started seeing 
URIBL_BLOCKED, and it didn't go away after midnight.  I tried switching 
to one of our other local name servers, and that didn't help.  I've been 
using this service for many years.   Do you know if their policy has 
changed?   Thanks. - Mark