Thank you for the localhost fix. Horde was driving me up the wall, and I can't imagine how much I would have freaked out had I migrated some MySQL over and it would have complained about not being able to connect to localhost -- I would have been digging up DB users and config all night, never once thinking that localhost was missing!
Now, did PLESK do this, or did the linux installer do it?? Because my hosts was there, but only with 127.0.0.1 and the FQDN of my server...