FS2024 doesn't start

Please add the msfs-2020 or msfs-2024 tag to your post, depending on which sim your post is about.
I can’t start FS2024. I use freefight, take a departure EDDB, choose the A330 and click the start-button in the right down corner. But the sim seekms to hang here; I never come to a button for starting the flight. I waited for about 5 minutes, after that I closed the sim via taskmanager. What can I do here?