I seem to be getting stuck in my campaign (with missions that freeze BTS) fairly early. My first campaign with V.14 was with the FWL. It was working great until I got promoted to Private and I accepted, and was transfered to a new world. After another garrison mission I received a recon mission and given the option to be jump infantry. It was a 5 month mission, I believe. Unfortunately, it freezes before the loading screen with the bars. I still have the save if you want to see it.
Then, I started a new campaign, with the Fed Suns. This time, it happened on an evac mission that also lasted multiple months. This time, Infantry-FMG was the only option in the drop down. Again, I have the save still. I'll try a 3rd time and see if I can't make it out of infantry.
Also, I stupidly didn't read the balance guide included in your installer, assuming that I could find the keys listed in-game somewhere, perhaps under key binds, but I haven't spotted it yet.
Also, in the couple instant actions I did, the LRM in the Dragon 1N and another mech I tried seem to be unable to twist with the torso, IE I was trying to twist and shoot at 9'oclock to my leg's heading, and they would invariable shoot far to the right. If the torso is twisted, the only reason I can think why that would happen would be if it was mounted to the legs, or maybe the weapon's line of sight is blocked by the chassis.