In FMB when I make a group of single engine fighters spawn at Devres some spawn in the single engine hangars (German type) that come with the map (not put by me there). These explode immediately after spawn. My suspicion is that they somehow collide with the concrete floor as the hangars never are really on the ground - the upper floor surface that is. So I guess that as the plane spawns with its wheels on gras ground there's a collision with the floor volume as the upper surface of the concrete floor is higher than the grass floor. A dev would like to take a look into this?

Also I think (as mentioned by Atas) that we need dedicated bomber spawn points as bombers definitely would explode if they are spawned on this field.

When I make the planes spawn as parked they spawn at the spawn places. When I uncheck spawn parked the planes will spawn somewhere in the Channel. Same when I check scramble take off

After the two planes spawning in the hangars explode, others disappear except the player plane and two others. They launch their engine and don't do anything else except one of them that dips its nose into the ground.

For info: the first waypoint is defined as take off on the field Devres. The following are normal flight points.