How are you configuring these printers?
I re-read your post, and your problem is probably different than mine, but I'll share the experience with you anyway.
On RH EL systems, at least our EL 4 systems, if I use
Applications --> System Settings --> Printing
to configure our printers, all kinds of annoying things happen. I'll elaborate in a moment.
The "other" GUI method has never given me a problem. That is start a browser session; enter address localhost:631; and login as root when prompted. I have never had a trouble configuring our CUPS printers using this method.
One side effect of the menu-based printer-configuration way is that some printers' Location fields are filled in by the Red Hat printer configuration name and revision.
The other is for our App Jet Direct print servers that are not listening port 9100 -- they happen to be connected to older Net Print print servers that default to port 10001, those Net Print print servers' entries all get defaulted to port 9100 after running printer-configuration.
I never found this problem on Fedora 6 or Ubuntu 6.06, 7.04, and 7.10.
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