Hiya,
I recently upgraded to XP12 and upgraded my old IXEG 73 to the new one. I'm coming across a big issue for me tho. Might be skill issue, might be a bug. Whenever I'm setting up my flight, the FMC doesn't calculate altitudes for VNAV, indicating VNAV is not going to work. I did the init ref page etc., still nothing. After take off I can't enable LNAV, and pressing VNAV tells me "perf/vnav unavailable". Any ideas?
Much appreciated!