With one my mates we tried the mission in attachement.
I hosted via HyperLobby.
We killed AI planes and got no CTD.
Usually we play IL2 1946 4.09m + UP 2.01 + Zuti's 1.13 and use IL2 DCG 3.46 to manage the dynamic campaign and create the missions.
In attachement is one of this missions.
All seem works fine.
But the AI behavior seems to be very flaccid...
So may be the problem is in the QMB. It was my two cents.