Ok. I found it.
- my first leg was ok.
- my second leg is nok, plane goes completely to the left.
- only difference is the update to the last version with Dune Extension.
After speaking on the other feed of this forum (Pilatus tailwheel problem), they told me about problems with controls after the Dune extension. I just checked.
There is effectively a new profil, which is active per default: Ornithopter (from Dune).
Instead of my usual default profile
I retried this plane and this bush-trip with my default profile, and the problem is solved !!
→ If developers do this kind of changes, per default, they should AT LEAST WARN PEOPLE about that. !!!