Solved. At least for me.
The 777F Freighter model works good.
I replaced the config files of the 777F model into the 777-300 that was always banking on the right and it worked.
If you own the 777F copy all the files .cfg .flt .loc inside the folder:
Community\captainsim-aircraft-m774\SimObjects\Airplanes\CS_B777F_GE110B1
EXCEPT the file: aircraft.cfg
and replace in the folder of your not working CS777
Community\captainsim-aircraft-m774\SimObjects\Airplanes\.......
i hope it helps.