Can't delete account

I use admin page to delete account but It doesn't work. Pop-up window to confirm deleting account is hang after I've pressed "yes" to confirm.

My server : Fedora Core 4 (2.6.11-1.1369_FC4)
Zimbra : zcs-3.0.0_M3_436.FC4

Regards,
Chotima

This is fixed in a newer version:

http://bugzilla.zimbra.com/show_bug.cgi?id=5367

until you upgrade you should still be able to delete accounts through the command line:

su - zimbra
zmprov da accountname@domain.com