I have been testing zimbra for a few weeks now, and just recently installed version 5.05 on a new server which is set to be put into production next week. I have about 30 accounts set up on this machine, but no users are actively using those accounts yet. When I log into one of the accounts and try to send a message I get a dialog box which reads: "Contacts not loaded, yet" when the contacts field tries to auto-complete. I've looked around for information on this and only found this bug report, however I'm not sure it's the same issue since I have seen nothing about a "bad JSON response".
Thanks for the help,