Your profile has "ZCS 4.5 (Open Source) | OS version: Ubuntu 6.0.6"
The 'blank admin console' is a known issue with 4.5.x and FF3.
There's no more 4.5.x builds planned except for
absolutely critical security issues, so I'm not sure there's much we can suggest besides looking into a 5.0.x series upgrade.
(I'm still not sure why you and
keemat went with 4.5.x - it had sounded like you we're doing a brand new install for a convention or something. If there's no blocking reason, might be time to
upgrade to 5.0.7)