I have a new EchoUAT installation with the iFly740 montes in the panel as the GPS source for the D100 Efis & autopilot. Yesterday I flew a ~ 100 mile SE course at 7500ft. Every thing worked as I expected with targets identified with direction triangles and digital altitude displayed. When I returned at 8500ft. I only got some smaller triangles with green or yellow color and no altitude report. I touched one of the little triangles and a pop up box gave me the altitude and in addition, the N number. There was a lot of traffic and the radio was alive with discussion of skydiving. Once in the clear I tried several things thinking it was setup, but no joy. When I started to descend toward home the altitude depiction returned some where around 7500ft. Am I doing something wrong or is there a hard setting that surpresses the altitude report under some conditions. Thanks, Bob