Hello all...!Thanks for gread "ActiveSky wxRE". Well, i write some english!So, Altitude is problem! Why, I fly with Aircraft, sould with Auto ALT Hold (Autopilot) to FL250. I see on Altimeter panel, it is FL250! Okay... But, ATC warnt me, it is 300 under FL250 (FL220), now to FL250 up! But, i look "Shift+Z", show ALT 23000 (FL230), i make change to FL270 up! But, ATC call me, cancel of IFR now! Than to VFL! I had some problem! ATC call to AI Traffic, some problem with ALT! Where is problem?I have get new FSUPIC v2.974. Well, i try... Aircraft stand on mountain (500), i look by Panel ALT 0!!! Why...! Problem with FSUPIC or ActiveSky wxRE...?Please help me.....Sebastian

Sebastian,Welcome!At anything at FL180 and higher, your barometer must be set at 29.92. Use the little BARO knob to change the value. Do not use the "B" key. Hope this helps,JimActiveSky Support