Got my Zimbra server up (FC3) and it all seems to work except... When I go to create a new domain, the dialog comes up, I enter the new domain in the form "example.com", it's not flagged as an error. I can click through the "Next" button on the dialog, the "Finish" button shows enabled, but clicking it does nothing, and there's no error; the dialog just stays there and I have to cancel to clear the dialog.
So is "example.com" (as opposed to "something.example.com") a valid domain name? If it isn't, shouldn't it be flagged as an error? If it is, what have I done wrong?