747 lnav problems

[Stormenson 1]

Sorry i made the same post in 747-8 forum page accidently

I did a format on my pc and i reinstalled fsx steam edition and my pmdg addon 747-400. 
I dont know why but the Lnav Or the map panel doesnt work properly .(everything was fine before i format my pc. i Olso know how to setup my fmc so i am sure 100 % this issue is not caused by my mistake in game)
YOU will be able to see in the pictures that the plane is moving to the right off the route 2-3 degrees , i used high speed rate to see where the plane will go finally and i found out that the plane was moving correctly to the target  waypoint at the correct time but not on the  route line .
IS there any fix for this , is this a known bug ? 

 

http://postimg.org/image/6av9wtc4x/

http://postimg.org/image/axdfz2dhn/

http://postimg.org/image/w72phdap5/

 

 

Tried to fix registry with flight one registry but no change
Tried to reinstall addon but no change too
i will reinstall the game, still have the same problem

[Stormenson 1]

Sometimes the plane is moving like this , it seems is going 2-3 degrees to the line but it moves parallel to the line

http://postimg.org/image/6qbv8819l/

 

 

it still fails to establish with the line correctly , i cant find solution

[Stormenson 1]

I found it !!! i found the solution here http://www.aero.sors.fr/navaids.html

everything works fine after this magdec.bgl folder replacement in fsx/scenery/base/scenery folder!!

Hope everyone with same problem can solve it the same way !!!