[ubuntu] HP LaserJet locks up

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http://ubuntuforums.org – I'm trying to get an Ubuntu 10.04 system to print to an HP LaserJet 3052 attached via the network. I had it working fine for a while, but something must have been changed or updated -- I have no idea what changed, and it's driving me nuts. I've tried uninstalling all hplip* packages and setting it up with the standard "add printer" thing, manually entering the IP address for the printer (which ends up with a "socket:" URL). I've also tried installing hplip and running hp-setup, and letting it auto-detect the printer (which ends up with an "hp:" URL). In (Hardware)