When prompted for the root password in rh6.0 install, I entered "XxX.$YaY". The installer accepts this password but after the system reboots, I cannot log in as root. I repeated the install 3 times with the same result, so I'm sure that I typed it correctly. workaround: use a password with just numbers and letters and then change it after the first reboot.
I have verified this to be true with 6.0. This has been assigned to a developer.
This issue is solved in the latest installer available in beta.