Hello i am having the same isues that Jonathan is having!! i flew from PANC to PABR in the 737-200F and all was well. the next day(today) i load up in barrow(PABR) and takeoff.. as soon as i take off i click on the GPS/NAV switch from NAV to GPS.... then i turn on AIL and then ELV then move the switch from man to NAV LOC and my plane turns from a departue bank to straight and level flight!! so i turned off the ELV hold and it starts to turn on course!!! i then cancelled my flight and went to KSRQ and tested out the 737-200 model to see if it was the F model and behold it still was screwing up!!! its got me really pissed off and i would like an answer from a coder of the plane as to why this is happening! i just bought this plane last night and it works! right now ive wasted my 70$ on this plane  >:(