I've recently upgraded our mail server from ZCS 6.01 to ZCS 6.04. All seems to be working well until this morning when I login to zimbra admin console, it only displays the logo. After loading the page nothing happens. It just shows the logo. I've tried restarting the server twice. Still no luck. It doesn't happen during the previous version ZCS 6.01. I have attached a screenshot of the problem. My browser is Firefox 3.5.6. I've tried it with I.E 8.0 but still the same.
Can I downgrade it to ZCS 6.01 or 6.03, or overwrite it with another installation of the same version of 6.04. I'm using Ubuntu 8.04.3 Server. Please help...