I've been trying to document and isolate why there are intermittent stability issues with the offline missions. I thought if we could share our experiences we might be able to help isolate the issue.
I took a step back and started with the oneonone.mis and just changed the planes to 1 SpitV vs 1SpitV. And after a couple the second attempt the mission stopped working.
So far it looks like there is an issue with the memory cashe. Exiting and restarting AH2 does not clear the memory. The only thing I can do to get the missions working again is to go online (just log into any arena) then once in the arena exit online and go to offline and the missions will work again.
Things I've noticed when the missions stop working-
1) No messages from "LEAD"
2) All wingman in my flight either disappear on the runway or never even show up
3) The "Warp" never occurs to the engagement area
4) The enemy may or may not be in the engagement area
5) Sitting on the runway and the circle drones magically appear overhead