After more troubleshooting, I've came to the conclusion that "Moodle" && "Horde" don't play well on the same LAMP system. Horde uses the setting "session.save_handler = user", while Moodle uses "session.save_handler = file" in the php.ini file. Can I assume this is a correct and true statement??? I still had issues with login, but until I load a fresh system, I believe the problems lie with incompatiable php settings.
Thanks for your support, and a great product!