Similar situation. Launch button added, but everything crashed when I went back to add the icon.
** Attachment added: "Panel Crash Report" http://librarian.launchpad.net/6392135/_usr_bin_xfce4-panel.1000.crash -- panel crashed during attempt to add new launch icon https://launchpad.net/bugs/72089 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
