Created attachment 3988
replace Control by Primary in keyboard shortcuts
Gtk+ recently switched to using Primary instead of Control for the control key (see http://git.gnome.org/browse/gtk+/commit/?h=gtk-2-24&id=1f6a921158b5a4fa80ea2e844ce25aad04101aaf) the keyboard shortcuts as shipped in libxfce4ui are wrong (no problem with xfwm4 since it doesn't depend on Gtk+ for that, afaict).
Attached patch fixes the problem for future installs (not sure if/how we should handle current mappings, which don't work anymore until people rebind them).
We're probably better of making some workaround in the code.
The GTK change actually only exposes a problem in the way how keyboard shortcuts are matched, see https://bugzilla.redhat.com/show_bug.cgi?id=768704
Fixed in git master branch.