oh what an easy answer, great support …
To verify it, if the navdata are really the issue, you should do two additional test-flights:
- remove the addon sceneries and try it again with our navdata
- remove our navdata (so you use the stock data) and try the flights with the addon sceneries
On one of the two scenarios should be result in a CTD - if in both, than you have any other problem on your system. When in #1 only it´s a navdata issue, when in #2 only it´s a scenery addon issue.
Also, it is not unimportant which aircraft you were using, and if you´re using any addon-linker programs or similar else. Or, if your scenery-file is a mess, or, or, or … you see, it´s to simple to say only , it´s a navdata issue.
Which freeware sceneries do you use, that I can also try to reproduce it … Which aircraft, which flightplan, which ILS …