@Crabby:
Thank you for your response.
Yes, I should better say: "it COULD be a bug", sorry I am not a native speaker.
I checked all the bindings, they are as they should be and everything else. I do not find the cause. The problem started after one of the updates.
As I said, the A300 is the only A/C with that AP1 issue. PMDG and the "others" works good as speaking about the AP.
Anyway, the aircraft is still good to fly even with my AP1 problem. AP2 works as it should.
Cheers,
Chris