Thanks for the help Stephen.
I downloaded and installed the RPM you mentioned. Also re-installed CUPS.
The SME is prompting for authentication (our NT 4 domain accounts are manually synchronized with the SME), and I can't seem to find an account that works. Also, still unable to browse the SME box - error message is something to the point of "server not configured for transactions".
I'm almost ready to do a backup, reload the box, and restore user data / mail. My only concern is what samba data is backed up, and whether it will cause me headaches after a restore...
Name resolution, etc., seems to be OK, and errors relating to Linux in general I located on Google point to samba.
Is there a way to wipe the samba config and just start over? I'm fairly new to SME, which is my other problem.

Thanks again.