using the FL version <zk.version>7.0.1.FL.20140121</zk.version>
opening the attached page causes a JS error

Uncaught TypeError: Cannot call method '$n' of undefined zul.mesh.wpd:800
zul.mesh.MeshWidget.zk.$extends.onSize zul.mesh.wpd:800
zk.Object.$supers zk.wpd:10561
zul.sel.Tree.zk.$extends.onSize zul.sel.wpd:2754
_invoke zk.wpd:12457
zk.$extends.fire zk.wpd:12440
_fire zk.wpd:12583
zWatch.fireDown zk.wpd:12678
zk.override.fireDown zk.wpd:13965
zUtl.fireSized zk.wpd:14474
zk.Widget.zk.$extends.replaceHTML zk.wpd:16105
mtBL0 zk.wpd:18197
mtBL zk.wpd:18168
doEnd zk.wpd:17778
zk.copy.setLoaded._zkf zk.wpd:17816
(anonymous function) zul.sel.wpd:4296
doEnd zk.wpd:17778
zk.copy.setLoaded._zkf zk.wpd:17815
(anonymous function) zul.mesh.wpd:3236
doEnd zk.wpd:17778
zk.copy.setLoaded._zkf zk.wpd:17815
(anonymous function) zul.menu.wpd:1616
doEnd zk.wpd:17778
zk.copy.setLoaded._zkf zk.wpd:17815
(anonymous function) zk.wpd:27006
doEnd zk.wpd:17778
zk.copy.setLoaded._zkf zk.wpd:17815
(anonymous function) zk.wpd:24015
doEnd zk.wpd:17778
zk.copy.setLoaded._zkf zk.wpd:17815
(anonymous function)