Only when using Places to mount drives. Click Places -> Click ExternalHD -> mounts/opens -> xfce4-panel no longer autohides Restarting the panel solves the problem. Can I help with any more information?
Hi, I get the same issue on Xubuntu 12.04 x86_64. I have to kill xfce4-panel and restarting it allows to retrieve the autohide behavior. I get this warning when I click on Places plugin: (xfce4-places-plugin:9687): Gtk-WARNING **: GtkSpinButton: setting an adjustment with non-zero page size is deprecated
While the problem still seems to occur, it's in the places plugin not in the panel.