@Nilt, regarding your question, I just tried it on a fresh machine, but it seems to work for me. So that is not very helpful to you. The Frontier logon prompt popped up, I entered my details, went through a few screens to show Frontier I'm really not a robot, and then had to push "Accept" to allow the app to connect to the API. After that, the app updated the screen to my last known position in the game.
Do you go through this whole flow as well, or does it stop mid way?
You can try enabling verbose logging in the app and emailing me the log.txt file which may explain why things aren't working. There might be a bug, I seem to make those more often. Instructions on how to turn this on can be found at
https://apps.magicmau.nl/EliteG19s/Docs/EliteG19s-Manual.html#user-content-Troubleshooting (go to "Send Log Files").
Thanks!