CentOS - Mar 2008 - CUPS gone wrong?

Did something change since (at least) CentOS 5.1, kernel 2.6.18-53.1.4
that would affect the CUPS printing system?  I am no longer able to
connect to it and that seems to be impacting my ability to use the
newest unreleased beta version of SeaMonkey.  (My standard release
SeaMonkey, 1.1.8, works just fine, but I think that using CUPS is new
in the 2.0 beta.)

Any constructive input appreciated.

mhr