I suspect that Desastersoft used a combination of specific waypoints and editing the AI sliders in the mission builder to overcome the AI's shortcomings in previous versions.
Since there have been modifications made to the AI in this patch to make them fly in a more natural way, it could be a case that Desastersoft's tweaks are not working anymore because the base AI programming on which they are applied has been modified.
I think your best bet would be to contact Desastersoft on their forum and confirm this. If it is true, then they either already know it and they'll tell you when they will release an update to fix it, or you will be the one to bring it to their attention and get them working on it.
Hope you manage to get it sorted out either way, cheers
