I just tried 0.51 off of my local network. When I start Zimbra with network connectivity, I get a hang on the "Loading" screen. I never get to the actual app. This is on Sabayon Linux with Firefox 2.x. Under Internet Explorer 6.0 it just hangs on a blank screen.
I'll test later with Internet Explorer 7 and then do all 3 with no active connection.
Has anyone seen this issue?