Last Saturday, we updated our ZCS from 5.0.7 version to 6.0.6, we are running over Centos 5 32 bits edition. Everything runs fine at migration time, the system is running smoothly, but we have an endless display form opening window in some Ajax Clients, when users tried to send mail or open a new arrival message.
Surprisingly, it does not happen with every user and it is independent of the browser used. We deactivate virus and firewall settings, we downgraded java version, we upgrade firefox and explorer versions and the issue can no be fixed.
Boxes with the issue, run windows 7, windows xp or linux, before 6.0.6 we do not have any issue with the Ajax clients in any machine.