KSP: 1.2.2 Windows 64 bit, Steam version
Computer: Windows 8.1 64 bit, Intel i7 4710HQ, 16 GB DDR3 RAM, GPU nVidia GeForce GTX 970M 3 GB GDDR5
Problem: I'm flying two separate unmanned vessels, both being controlled by a CH-J3 fly by wire controller; one is going to Eve, the other one is going to Jol. I can't control the throttle on both crafts discretely (which means with the Left Shift - Left CTRL keys); I'm able to change the thrust by either full on or full off (with Z and X keys). The problem exist with this save file only: opening my old saved game, the crafts throttle seem to work just fine. Here's what I've tried so far:
Opening another save file: it works, I have issues with just my current save file.
Remapping the keys for discrete thrust: didn't work on the current save, the new key binding works on the old save (which, again, had no problems from the start).
Running KSP as administrator: didn't work.
Removing all mods except MechJeb: didn't work.
De-activating Windows 8.1 accessibility options (I'm not sure how it's called in English): they were never activated in the first place.
Cussing at the keyboard: didn't work, but I felt slightly better.
I've read on the Interwebz that other people had the same problem with Shift and CTRL, and it was due to a program called Synergy, but I don't have such program installed on my PC (unless it's a buitl-in Windows feature).
I am also unable to revert any of the flights to the launch pad, as I improperly closed the game (read: ragequit).
I have to point out the fact that I'm using the in-game cheats for infinite propellant and infinite battery power; don't judge me, I like to focus on the orbital mechanics rather than the rocket structure itself.
Mods installed:
MechJeb 2.6.0
Reproduction steps:
I have no idea, I can't reproduce it myself, if not with the save file in question.
Log:
[snip] I hope it's the right file, if not please let me know.
Thank you.