just upgraded to 5.0.11 - SSL + login problems

[admin1]

We just upgraded from 5.0.9 to 5.0.11
When attempting to logon to Zimbra we get an error message stating:

"Oops! It appears your browser does not allow cookies. You need to enable cookies in order to use the Zimbra Collaboration Suite." (even though it DOES allow cookies)

If we manually change the URL to "https://webmail.norwoodma.gov:444" (444 is our custom Zimbra https port) we are logged on OK.

We use mod_proxy in our own apache installation (We have an http URL ProxyPass to https):
(from httpd.conf)
ServerName webmail.norwoodma.gov
SSLProxyEngine On
ProxyRequests On
ProxyPass / https://norwoodma.gov:444/
ProxyPassReverse / https://norwoodma.gov:444/

Here is our Zimbra setup:

[zimbra@bet ~]$ zmprov getServer bet.norwoodma.gov | grep Auth
zimbraMtaAuthEnabled: TRUE
zimbraMtaAuthHost: bet.norwoodma.gov
zimbraMtaAuthTarget: TRUE
zimbraMtaAuthURL: https://bet.norwoodma.gov:444/service/soap/
zimbraMtaTlsAuthOnly: TRUE
[zimbra@bet ~]$ zmprov getServer bet.norwoodma.gov | grep Mode
zimbraBackupMode: Standard
zimbraMailMode: https
zimbraMailReferMode: wronghost
zimbraReverseProxyImapStartTlsMode: only
zimbraReverseProxyMailMode: https
zimbraReverseProxyPop3StartTlsMode: only

Any help would be appreciated!

Thanks

[admin1]

There is no valid license installed. (even though during the upgrade it said that a license was found)

Help!