I've uploaded a small fix which should the problem for users who use the default config (xorg.conf ones).
As workaround is you use a custom conf could be to edit /etc/xdg/xfce4/xinitrc (or copy it to ~/.xinitrc and modify this file) and call xfce-mcs-manager before calling xmodmap.
I've uploaded a small fix which should the problem for users who use the default config (xorg.conf ones). xfce4/xinitrc (or copy it to ~/.xinitrc and modify this file) and call xfce-mcs-manager before calling xmodmap.
As workaround is you use a custom conf could be to edit /etc/xdg/