I filed a bug for this, it’s also on the forums. It has been reproduced by several users.
Here’s how to reproduce it:
- Pick a non GPS aircraft (example: m339, Spitfire, Shock Ultra, etc)
- Set a Departure airport
- Set an Arrival airport
- Make the flight
- Return to the World Map
- Set the same Departure airport
- Set a new Arrival airport
You should then observe that the Arrival airport you set was in fact not set, and you are pinned to the Arrival airport you set the first time.
Here’s the full thread: Flight Planner Bug: Plotting a new route in the world map doesn't take effect - #32 by mblpenguin