It's happening to me, too. I had reported it in another message that I can't locate right now, but was basically told it was a display bug and to just use the Toolbox function to refresh the screen.
To be sure, doing that does seem to return the segments to show "ground" instead of a blank entry. I haven't yet tried this out where I had a road with an elevation different from "ground." (I'm not saying that it hasn't happened - I just haven't been dealing with a road with a different elevation level.)
It became way more obvious that it's happening (exactly as you describe) since the Validator now highlights roads with an invalid elevation setting.
Display or other type of bug notwithstanding, it's a real pain to have to deal with resetting the elevation (either road-by-road or with a Toolbox map refresh) whenever you edit a segment...
To be sure, doing that does seem to return the segments to show "ground" instead of a blank entry. I haven't yet tried this out where I had a road with an elevation different from "ground." (I'm not saying that it hasn't happened - I just haven't been dealing with a road with a different elevation level.)
It became way more obvious that it's happening (exactly as you describe) since the Validator now highlights roads with an invalid elevation setting.
Display or other type of bug notwithstanding, it's a real pain to have to deal with resetting the elevation (either road-by-road or with a Toolbox map refresh) whenever you edit a segment...
Re: Loss of elevation data