Night Lightning in the Cockpit

Hello,to all a happy new Year.I have a Problem with the Lightning in my 737'sIn the 2D Cockpit i can only turn on the Panel Lightning switch in the Overhead Panel. The Dom Light Switch is not working.Also the Key Kombination from the Key Assignments ( Toggle Dom Light ) will not work.The cockpit is so very dark in the night:http://www.starflight-virtual.de/pmdg/cpt_night.jpgBut in the Virtual Cockpit all is ok an the Dom Light Switch works:http://www.starflight-virtual.de/pmdg/ovhd_night.jpgThe switches are marked in the Pictures.Now .. whats here wrong?Is there anything wrong or is the Dom light not working in the 2D Panel??Pls. HelpMatthias