We are running "Release 4.5.10_GA_1575.RHEL4_20071117152457 CentOS4 FOSS edition" and after upgrading to Firefox 3.0 and noticed that the admin page doesn't load either. It looks like there is some kind of JavaScript error that is causing the page to not load correctly:
Error: resp.GetVersionInfoResponse is undefined
Source File:
https://mail.hddbroker.com:7071/zimb...v=071117154042
Line: 10737
Unfortunately the work around for me is using IE7. We are too going to upgrade in the near future to 5.x but that isn't going to be for another month or so.