Apparently, in my infinite wisdom, I threw up the following iptables rule:
/sbin/iptables -A INPUT -s 184.108.40.206/9 -j DROP
Guess what? This is the exact range that the LACNIC servers are hosted in! No wonder no LACNIC data had been coming into the GrabIP database lately!
This has been fixed.
Technorati: LACNIC, iptables