After a lot of Googling I found this explanation here at simhq Hope it helps you clear it up.

B

Here are two long-time bugs I forgot to mention earlier:

1. When playing online, if a twin-engine plane has one engine damaged (prop not spinning), other players viewing the plane will see both props not spinning. It's shocking to see the plane flying in this state.

2. 'Type 94 Truck' (Japanese vehicle, both Stationary Object and Moving Vehicle) is not able to be padlocked by the player. To be honest, this does not seem to be 100% of the time. In my experience, I can't padlock this vehicle about 95% of the time.

Aviar

Confirmed.
It should actually be the old mission present in 4.08 and 4.09beta. I wonder was it working back then? From what I can see there is a small bug in the mission file in the latest patch (4.09 final).

It was like that even in earlier patches. There are simply no Bridges on Pacific Islands map. I don't know why it was included like this, but maybe it can stay as a curiosity. ;)

Another long-time bug:

On the Italy_Online map.....the Genova Airbase. Jet planes will not take off from that base. Neither players nor the AI can start a jet plane engine on that airfield. Prop planes can be started normally.

Aviar

maybe it has to do with the length of the runway?

Yes, I think this issue was explained when Italy map was released.

BTW, I checked Pacific Island Armor attack in QMB on 4.09beta and the mission wasn't working even then.
So the good news is, DT didn't introduce this bug, and another good news is, it will be fixed.

If you know what the issue is, would you mind explaining what it is? I've never heard an explanation.

Also, to be accurate, I just found out that this particular issue does not affect every jet plane on the runway. Only the LAST plane on the runway has an issue. So, if you place a flight of 4 jets on the Genova runway, only the last jet will have a problem starting it's engine.

Aviar

SM79 Dorsal gun
 

I hate to confess my ignorance, but I can't figure how to open the dorsal hatch for the top gunner. Any ideas?

Never mind. I just found the directions. He who can read can rule the world.

Im having problems in the full mission builder. Apart from placing units of a type and the type not being what i selected, which seems to be erratic, one problem i get EVERY time is a minimizing to desktop every time i try to change the loaded map. It seems IL2 now remembers the last map you had loaded when you launch it, rather than the FM builder being empty on start, so this means that the screen freezes sometimes when trying to load a different map. its odd really, because it will either Minimize to Desktop or i will have to task switch around then back to IL2 to load a map, or it will minimize itself.

Ive no idea whats causing this. Im on Vista32 with Clean Install of IL21946 with 408m and 409m, both downloaded from 1C FTP server.

I found it odd that noone else has mentioned it yet, so i thought i would ask.