I just thought I would share that I never have any problems with reloading the 767 after saving and closing fsx. All I do is start a flight with the 172, then load my saved flight. Usually the only thing I have to reset is change the A/P from heading select to LNAV. I must just be lucky?  :o Try loading a flight with the c172 first, might work for you?

BTW, you may want to send your email to Mark using the forum's personal message system, just to avoid those spammers  ;)