Problem saving flights 'mid-flight'

Hi allThis is strange. Until recently, if I was undertaking a long flight I'd often save it mid-flight then come back to it at another time - sort of carry on where I left off.Now, all of a sudden I find that, whenever I try and do this, the flight is completely unmanageable. The FMC not only no longer fails to control the flight, it seems completely u/s. Worse still, so is the autopilot. None of the controls on the AFDS has any effect.I am using Lee's PIC/POSKY merge setup (have been for a few months now) with Pete Dowson's fsuipc version 2.9.0.1. O/S is winXP. Until this started about two weeks ago everything was rock solid. I could save a flight anytime and, whenever I came back to it, the aircraft and all controls, including the fmc, carried on as if the flight had never ceased, just like the sample flights in WILCO's original package.Anyone any suggestions at all?Paul Croft