This bug has been reported for two years or so and remains unfixed, and renders the active pause feature for learning skills completely useless.
When you put the aircraft in Active Pause for an extended period of time, the trim slowly creeps down the axis until the plane is wildly out of trim. This can easily be duplicated by simply jumping into single player, turning on the Ctrl-Enter controls that let you see your stick positions, placing the plane in active pause, and then accelerating time. You can watch the small trim diamond slide slowly down the axis until it's pegged at the bottom. Likewise, and external view shows the tailerons pitched max down.
The moment you leave active pause, the aircraft wildly pitches, goes into a stall, and basically almost always crashes. Your trim button won't work in active pause, as even holding it down doesn't seem to move the indicators at that point. Nor is there a trim reset. The AI can't manage to get it together either. This happens again and again, and can be easily seen by anybody.
This renders active pause while sitting in the RIO cockpit, trying to learn the LANTIRN pod for example, basically impossible.
Given that it's been happening for years, is easily repeatable, and can be visibly watched happen, I'm shocked it hasn't been dealt with at this point. Can anyone help? It doesn't seem like the kind of thing that would be hard to fix.