Please check your PM, it seems there is a misconfiguration somewhere. I would only need a few minutes of access to find&fix the problem, however it's late here, so if you cannot reply now, I would check it tomorrow. Thank you.
The problem has been found in /etc/httpd/conf/extra/httpd-hostname.conf. It is now fixed on the server, and the fix was applied in CB yesterday, however, I didn't think that the cause of this problem would be the same. Thank you for the report! We're going towards a stable CustomBuild 2.0 release