Only issues with track files I've had is DCS crashing trying to start them, but once it starts it ran 100% exact as flown, including an hour and half long formation flight and formation landing with like 10 aircraft on the GR server. I think all the tricks posted in all the threads here helps, do not fast forward, do not touch it for 10 minutes while the flight starts, only replay on the exact version of DCS that recorded it, ect.