Recently purchased OPUSFSX and installed the new FSX update to REX OD (released in November). On long haul flights, the FMC is disengaging with wind shifts. This has happened with both OPUSFSX and REX. Anyways to prevent this from occurring.
I like both Wx engines, but need to leave the MD11 to fly itself in real time on transpolar routes (Dubai to Anchorage, for instance).