Device: Ipad 9 (3 GB), iPadOS 17.3 (21D50).
Settings: No clouds, no traffic, limited frame rate, pixel density 60%, exit from all other apps and device restarted.
Heathrow: I can fly with the Cessna, Bucker, Ec135, Robinson, Ju52, Baron, Learjet, Q400, A320, MB339, F15, F18 planes. However, it crashes with the 737-900. I haven't bought another plane yet.
Anyway, the app is stable, the mountains are up again, Istanbul is fine too. I can go to Heathrow with the Ec at 70% pixel density, unlimited frame rate, medium traffic and cloud settings.
I also noticed that the civil visitors from the smaller airports, the tables and menus from the terraces have disappeared. The gas station from Biel, etc. The triangular building can be seen again in Wasserkuppe.