...if the decimal symbol in System Setting > Region > Additional Settings is set to other symbols as the point, eg. comma or so. Please fix it in the next update.
After more than two years this simple problem is still not fixed!
How embarrassing is that :-(
The map in "Schedules" BTW is working, no matter what your Region-Setting is! Just do the same in "Flight Plans" and "Airports", please.
Is it realy that hard?!?
If I could kindly ask you to contact Just Flight Support via the following link, our support team will be able to assist with troubleshooting this: https://www.justflight.com/support