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Hi Grzegorz,are you a magican or is it a miracle. It works! Yes, it works that way. Thank you for the great tip.I have tested three times that way. Then I changed over to another airport and reseted the fmc to the new location, fine operation. Is it metaphysic ??

Grzegorz and John , thank you for support.I´ve tried the fsx registry utlility. I think, the registry entrys are ok.The glassga.ttf are 3 times in:Windows fontFSXFS9but the FMC remains dark, all other PMDG`s works fine.I think, its a deep issue for the PMDG Developer........best RegardsLothar

Thank you guys, for your help and support.Yes, some perfomance changes in FSX cfg have I done before the FMS-CDU remains dark.Right now, today., therefore I have made follow steps:- J41 deinstalled with all liverys- in FSX an empty "Gauge folder" deleted- the registry cleaned with Tune up utilities- the FSX.cfg renewed- J41 new installed ( from AEROSOFT CD)- FSX startet with default glider and then switched to J41but nothing..........the FMS remains dark...So, I think the only one step is to reinstall the hole FSX with all addon (?)( I hope not ) thanks for further support

After a half year with good function with the J41 and many flighthours online with VATSIM suddenly the FMS-Display remains dark - without function. My system is XP PROF and FSX PROF.I´ve done troubleshooting with all. New installation FSX SP2 and J41. Registry cleaning and all things without succsess. PMDG answered with the known advice - FSX start with default flight and then handover to J41.But no solution - everything is tried, but the FMS Dispay is still dark. At moment I fly the J41 with VOR- navigation only without the FMS.In several internationals forums I´ve read about that problem - but no real solution was reported.It seems a deep systemfailure and PMDG has no answer...........