Hi ! Cant find any folder under username\appdata\local\pckages\Microsoft.FlightSimulator. There is e and then g under the lot of MS stuff
I probably should have mentioned, the Solution above is for MS Store version.
However, for Steam, those files would be:
C:\USERS\USERNAME\APPDATA\ROAMING\MICROSOFT FLIGHT SIMULATOR\MISSIONS\CUSTOM
NOTE: This may depend on how you installed the Steam version
Thank You @Hester40MT - Found the files under the Steam roaming profile. Worked great when they were deleted 
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SOLVED!!!
It’s known that the problem appears when using non-english characters in windows user name because the sim can’t find the custom flight folder when you are setting up a new flight.
I’ve resolved the problem activating, in my Windows 10 (build 20H2), the “Beta version: Use UTF-8 for language compatibility” checkbox.
To do that, you have to go to “Control Panel” --> “Clock and Region” --> “Region” --> “Administrative” Tab --> “Change system regional configuration…” --> and check the “Beta version: Use UTF-8 for language compatibility” checkbox.
After that the problem doesn’t appear anymore and you can set up a new flight without any problem.
Sorry, I couldn’t check that in other Windows versions.
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Thanks for this tricky solution! Finally works to change airport without any problems!
Ohh… I’m going try this solution! Happy new year mate. Thank you…
Thanks for the permanent solution. It works without any problem!
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Finally someone figured it out!!! This fix everything, from freeflight to missions!!!
Please @Beechc23 or @Hester40MT, this is the actual fix for the problem, mark it as Solution!
Congrats @CaptKennintong and thank you!!!
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Great job!!! Fixed!!!
Unfortunately, I got this problem after activating Beta: Use Unicode UTF-8 for worldwide language described here:
After deactivating Unicode UTF-8, everything worked normally with the navigation! So I use the previously described solution:
To delete the 4files. User / name / AppData / Local / Packages / Microsoft.FlightSimulator_8wekyb3d8bbwe / LocalState / MISSIONS / Custom / CustomFlight / CUSTOMFLIGHT.FLT & .FSSAVE & .PLN & .SPB
This what I was curious about. I had posted a DM to @ECTLG:
“Just curious if display of text works OK in Windows 10 and browsers (anything with text) is also OK after enabling that.” - which would also include text files that MSFS uses. Any text for that matter.
When I’m creating a new flight plan I’m unable to proceed with it and it opens the previous flight plan. For example if first set a flight from LELL to LEBL, this goes fine. But then if I set a new flight plan from LEIG to LERS it appears LELL to LEBL again. I’ve found an unelegant way to solve his by deleting the previous flight plan on AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalState\MISSIONS\Custom\CustomFlight
But I’m not sure if there’s another way to do that straight forward or some configuration that I’m missing.
Any help will be deeply appreciate Ü.
Thanks a lot, I followed the steps and now is working properly!!!
I can’t change my Starting location on the world map.
Plane always starts at the first location i used as starting location.
very frustrating…
Planing a new flight didn’t work either.
There is some info on some websites regarding the Win10 Username for causing this issue.
Best regards,
Harry
Does that happen if you pull in a flight plan from outside the sim i.e. something from SimBrief or LittleNavMap?
I had the same problem. The Microsoft team are working on solving it.
But there is a work arround. In:
C:\Users\your name\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalState\MISSIONS\Custom\CustomFlight
Delete the file CUSTOMFLIGHT.FLT (just leve the otheres) before you start the simulator
You have to do it every time you start from the globe-menu.
Stay safe!
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Hi @paranoidharry,
The cause of this is a non-ascii character in your Windows 10 username. Even if you have changed it - as changing it only does it symbolic.
There is a work around with what @BlondeAcrobat62 wrote or you can change Windows 10 to use the new Beta UTF-8 language set.
To do that, you have to go to “Control Panel” → “Clock and Region” → “Region” → “Administrative” Tab → “Change system regional configuration…” → and check the “Beta version: Use UTF-8 for language compatibility” checkbox.
EDIT: This post was merged from another topic.
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But this conflicts with the following: Citation CJ4 (and apparently all other planes) not following flight plan loaded from World Map planner - #18 by WrngwyCorrigan
And there you should instead uncheck Use UTF-8 for language compatibility “checkbox”!
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Exactly.
See my post above: