I'm also getting a similar error:
JavaScript error encountered in method ZaSearch.prototype.dynSelectDataCallback message: e is null fileName:
https://zimbraadmin:7071/zimbraAdmin...v=110304201819 lineNumber: 44767 stack: ([object Array],false,7)@https://zimbraadmin:7071/zimbraAdmin/
js/Admin_all.
js.zgz?v=110304201819:44767 ([object Array],false,7)@https://zimbraadmin...
I have lodged a support ticket with Zimbra about it.