Yesterday, I hosted a series of some 5 coops, and all of 'm were having issues.
They all were selected from the HSFX coop mission pack.
So, the thought was... what is wrong with hissy fit?
Well, as it appeared, it was all caused by the host, basically, by his choice of missions. (That Git!)
Somehow, I picked 4 missions, all 4 of them had the TestRunway2 in it, on a significant location. TestRunway2 is the ' higher' of the black runways, the one you can drop off of, the one that shows vehicles and objects placed on it rather sunken... )
The fifth mission was simply a completely mis-programmed one.
As if someone had programmed part of it on the Crimea map (Take off WP's and landing WP's on an actual airfield in the Crimea), and then used copy/paste to transfer some other part from a different mission on a different map. That's how we got trucks in/on the water, were shot at by invisble AAA (submerged in the Black Sea).
So, really, not much wrong there, you can just leave it up to some hosts to manage to select 5 consecutive missions out of 2400+ to get them all with original and true bugs in 'm....
Oh well... better luck next time!
PS. I am still working on a corrected/better set of coop missions for HSFX, and have just now replaced the TestRunway2 objects by TestRunway3. (Ship$RwySteel by Ship$RwySteelLow), some 330 missions had the high one in 'm. Finger Crossed!