try to switch light from 2d panel or assign the key for the light in fs setup.
I'm using the saitek yoke and I assign few buttons for the landing light ,taxi ,becon in another company md11 working perfect but as i say before with captain sim product there is a problem with the light and I hope it will be fix in 1,1 patch
Any way try to work with the light from 2d panel or assigneg button
regards
Chris
Sorry for my bad English
But I'm just simple foreigner :)