Problems with Staging

[kinru]

Recently, I have been experiencing an issue within the Space Plane Hangar concerning staging. Whenever I add a jet or turbofan engine to my craft, the stage for the engine does not appear. This occurs in the VAB and SPH, but is usually not a problem in the VAB as I do not use aircraft engines much there. This problem started after I installed the B9 Aerospace mod, which I think I have properly installed but I may not have.

Here is my list of mods:

• X Science
• AJE          (?)
• B9 Aerospace (B9 Animation Modules, B9 Part Switch, Firespitter, JSI, SmokeScreen)
• ChopShop
• Destruction Effects
• Kerbal Engineer   (It's outdated, but still works fine)
• Kerbal Konstucts
• Kerballoons
• KWRocketry
• Procedural Fairings
• RealPlume        (?)
• SETIrebalenceReactionWheels  (?)
• SmartStage
• Smokescreen         (?)
• Solver Engines       (?)
• Squad (Stock Parts)

I have added a question mark to the mods whose functions I've forgotten.

Hopefully you can help with my problem. Thanks!

Edited March 25, 2018 by kinru
Moderation took too long.

[kinru]

I was using the wrong version of the game with the mod.