Hi Gerhard - ah, okay, i suspected i might have misunderstood your issue.
what i had done was test the mod torps loadouts in the stock Betty, and those have no problem.
the problem, as i see now after playing your mission, and had the same thing with the pink Betty in the sea, and my Brewster exploding on the carrier deck at mission start.
and clearly, the problem is reflected in the error log, as well -
Mission error, ID_04: java.lang.RuntimeException: Weapon set '1xtyp91' not registered in air.G4M1_11
[2:50:40 PM] java.lang.RuntimeException: Weapon set '1xtyp91' not registered in air.G4M1_11
[2:50:40 PM] at com.maddox.il2.objects.air.Aircraft.weaponsLoad(Aircraft.java:2863)
[2:50:40 PM] at com.maddox.il2.objects.air.Aircraft.load(Aircraft.java:2504)
[2:50:40 PM] at com.maddox.il2.game.Mission.loadAir(Mission.java:1666)
[2:50:40 PM] at com.maddox.il2.ai.Wing.load(Wing.java:144)
[2:50:40 PM] at com.maddox.il2.game.Mission.loadWings(Mission.java:1344)
[2:50:40 PM] at com.maddox.il2.game.Mission._load(Mission.java:762)
[2:50:40 PM] at com.maddox.il2.game.Mission.access$600(Mission.java:120)
[2:50:40 PM] at com.maddox.il2.game.Mission$BackgroundLoader.run(Mission.java:463)
[2:50:40 PM] at com.maddox.rts.BackgroundTask.doRun(BackgroundTask.java:155)
[2:50:40 PM] at com.maddox.il2.game.MainWin3D.loopApp(MainWin3D.java:108)
[2:50:40 PM] at com.maddox.il2.game.Main.exec(Main.java:449)
[2:50:40 PM] at com.maddox.il2.game.GameWin3D.main(GameWin3D.java:235)
going through my Betty (the stock G4M1-11) loadouts, as the pics show, it no longer has the stock 1x91 torp loadout in the list, so this does seem to be a possible result of the torps mod..?
in the pics provided, note how the other G4M2's have the stock 91 torp loadout - the G4M1, which used to have this loadout as well, no longer has it...?
as well, when i opened your mission in FMB (after playing it once) i found that hte Betty loadout had reverted back to 'default' - obviously, as the 91 x torp loadout seems to no longer exist for the Betty - illustrated in my loadout pic below:
@ Gastrasz, maybe it's a related problem, but the rest of the Betty bomb loadouts are fine, it just appears as if the stock 91 torp loadout has disappeared....
p.s: another potential problem i see, is that the Betty no longer has a 'none' loadout. this can lead to further problems down the line, especially with campaigns/missions....
p.p.s - Dreamk, i am not using CUP, but a regular MA530 install, so it's not a CUP specific issue, for sure....