[jholder]

Try this:
>su root
>chown -R zimbra:zimbra /opt/zimbra
>cd /opt/zimbra/libexec
>./zmfixperms
>su zimbra
>zmcontrol start
>tail -100 /var/log/zimbra.log
(post that here)
>tail -100 /var/log/zimbra.log
(post that here too)