Darkstar Scramjet issue (valve)

Hi guys, i’ve searched a while now, but didnt find the solution… No matter what i do, both in challenge and in open world i’m not able to activate the “R SCRAM VALVE” on the Darkstars second screen (i can activate & deactivate every other valve, but this one just remains off). I have no issues to get above mach 3, but after after activating scramjet only the left engine (engine 3) starts & i lose control of the plane completely. Engine 4 remains off, no matter what i do & darkstar becomes uncontrollable & starts to spin & falls down.

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Already tried legacy&modern flight models, restarted the sim, reinstalled the maverick pack & so on… so the only reason visible for me is that valve. any suggestions?

Have you checked for duplicate controls assigned to #4?

Yepp, checked everything - all controls for e3 & e4 are the same & none of them duplicated for any other elements. All other valves work well - it’s only the right scramjet valve, which i cant activate. neither per binded key nor per cursor.

I also see the throttle lever moving for e4 while controlling & i have no issues on any other quad-engine planes - its e4 on darkstar only, as the valve is inactive and not controllable for me (on the screen i hear the same click-tone as of other valves, but it remains inactive).

PS: as i’m currently on a trip, i’d be able to record a video in 2 weeks if required/helpful