Quote Originally Posted by tweedledee View Post
If you are getting the same errors with the Foomatic driver, then the issue is not with the Samsung driver or packages. You might want to try re-installing CUPS and/or the various foo* packages to see if something has been corrupted.
Ah, didn't see this comment before making my edit.
Anyhow, yeah, it was CUPS. Reinstalled it, and everything's working fine now. (... well, almost. But images printing as gibberish is a problem for another day.)

Thanks for the help.