OK, I took myself some time for testing.
Runway 1 and 2 (static ships) are not even to the ground.
Planes set on them will bounce when loading and crash immediately.

OK, I found out, since its in the choice box of ships, you need to treat this runways like a ship and assign the starting point to the runway icon.

Runway 3 and 4 5 & 6 work.
You can arrange 3 and 4 with many of them to larger areas and set take of to start waypoints.
5 and 6 are large flats, they work.
Most important, what I learned, by default, they are assigned to the red party.
This does not work with blue party planes unless you change the runway to the same colour as the aircraft or neutral.
Then you can proceed as it was a real airport.
Now you can create yor airport with runways and taxiways and stuff.

Sometimes it takes a little time :-)

Thanks SPAD, this solved the problem.

I wished placing the runways would automatically remove the random trees. At the moment I am trying to build the historical airfield at Losonc/Lucenec on the Slovakia map, but all suitable locations are crowded with trees.

At least on the P-400 and the Ju-87D2 fuel fires continue even after the plane is out of fuel!

On the P-400, fires continue even after the plane is completely submerged! (And this isn't just a cool "oil fire on the water surface effect, it's a flame effect which emerges from the plane).

V1 Rocket launchers not appearing online
 

Tested on 412.2
Tested a mission today with V1 launching.
Offline in multiplay they work as intended.
Loaded onto an online server, the launch ramps do not appear and no rockets are launched.

I remember the V1 launchers were working online back around 4.09 - 4.10

More mirror stuff: I just noticed that the circular mirrors of P-47D and P-47D-27 don't block the sun. It would appear that the earlier model rectangular mirrors work ok.

P-40E fuel gauge doesnt work.
When the low fuel light goes on, the fuel gauge says its at 50%.
When running out of fuel it goes from 50% to 0.
Also the low fuel light says slo instead of low.

Yak-1B and I-16 mixture levers dont move/work.

After a few QMB dogfights i see that the AI pilot doesnt bail out of his burning aircraft and keeps maneuvering.

The Fulmar can fire its guns with wings folded. Also, artillery that requires a spotter will continue to fire on targets after the spotter aircraft is shot down.

B-29's rear gunner's head disapears when he's killed.

No it doesnt disappear. Its behind the body. I think it should not be fixed. Quite cool :grin:
Anyway, I think a 20mm, maybe even a 12.7mm should be able to to decapitate the gunner.