I had same problem, when remove zimbra 5.0.18 and install zimbra 6.0 after remove completed.
I get this error when saving blocking attachment on Global Setting:
message: cnt is not defined fileName: https://mail.ayamkampung.org:7071/zi...v=090830143748 lineNumber: 7838 stack: ()@https://mail.ayamkampung.org:7071/zimbraAdmin/js/Admin_all.js.zgz?v=090830143748:7838 ((void 0))@https://mail.ayamkampung.org:7071/zimbraAdmin/js/Admin_al...
Please see
Bug 40335 – Admin console : Characters are dropped in Notes description field while edit resource
this Bug unresolved?
My zimbra 6.0 running under CentOS 5.3 Up to date