This behavior manifests as well on a clean install of 6.10. However, Mr. Noble notes a 75% failure rate. For me it is 100% - I've not been able to edit the GNOME menu in any way. This includes checking and unchecked entry to make it visible.
-- Menu editor inconsistent behaviour https://launchpad.net/bugs/64851 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs