apt plugin from debians hobbit-plugins package

Hey all,

The apt plugin, which checks if apt-get update is run regularly, doesn't seem to work since I've upgraded to Debian Lenny. The file /var/lib/apt/lists/lock doesn't get updated anymore and that's one of the three files it checks for the timestamp. after 1.5 days, it turns yellow, no matter how often I run apt-get update. Anyone with that same experience? I have this on multiple machines.

Wouter