New installation of Foreman 0.5 on CentOS 6. After importing facts and hosts, I was not able to edit the host and save any of the changes (environment, classes etc). No popup warning. When browsing through Foreman log I found warning of 'Failed to save: Domain can't be blank'. I am running with unattended mode disabled, with Puppet master on the same node, both Puppet & Foreman being served via Passenger.

After entering a domain, I was able to save settings/classes for the host.