Solutions
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Callager's post in GEAR and TCAS problems was marked as the answerTechnical news, good news
PDMG support send me a procedure to uninstall the PMDG 777 and all files in diffferent folders of FSX.
I applied.
I also cleaned up my ssytem off all 'PMDG_777*' file in my system. I found one dll in a strange place. I delated it.
After that, I reboot and reinstall the PMDG 777, and every thing is OK now.
I made a test flight, great!
Thank you very much to the PMDG support, fast and efficient.
Gilles Carré