Hello I try to do the tutorial flight and followed every step as written down. Takeoff is no problem, but from the start on I realized that the altitude readouts in the pfd of the 1st and 2nd FO vary to a great extent. You can see this when you compare the attached pictures, which are taken from the 1st and 2nd FO point of view at the same time in flight. The other thing that happened e v e r y time is, that after 10000 ft (1st officer's readout) the plane slows considerably and the climb rate drops dramatically. A short while thereafter you can see the fmc recalculate and tell "unable crz altitude" (see attached photos). (Notice also the vast difference in the altitude readouts of 1st and 2nd officer in flight, as these pictures are taken seconds after each other!) I read somwhere that fsuipc could cause performance problems, so I deleted fsuipc.dll in the modules folder. I use Win 7 64 bit, TrackIR, Saitek X52Pro Stick and Rudder pedals, EZCA Camera. REX Wheather is disabled and all settings as proposed in the tutorial. Any help very much appreciated! Thanks in advance! AlexI just realized, that the resolution of the pictures is not good enough, sorry for that! FS is not running any more so I won't take any new ones at this time. Anyway the altitude readout on the ground was something like 40 (1st officer) vs. 200 (2nd officer) and in flight 10000 vs. 30000! Alex