Yes, if someone knows anything about this, please help.
Snow Leopard also broke the HP Maintenance Utility on my system. I use a DesignJet 90r. The printer itself is visible in Preferences and I can print to it. But under Leopard I was also able to launch the printer utility -- a browser-based HP application -- from the printer queue. That utility is gone.
The utility is a critical part of the DesignJet printing system -- it's used for calibrating the printer whenever rolls of paper or inkjet cartridges are changed, cleaning print heads, and other maintenance. Not having it is a show-stopper.
I've downloaded and reinstalled the print driver update three times now, reset the printer system twice, fixed permissions and rebooted several times. I'm convinced that the update -- such as it is -- is being installed correctly.
I also spent some time on the phone today with an Apple support rep, who was polite but unhelpful. I have contacted HP support by email, but am not optimistic.
Another day of this and it'll be time to downgrade to Leopard. Disappointing, to say the least.