Landscape keeps disappearing when trying to edit it

Starting yesterday, I’ve been editing a level with a landscape. I can add and remove things from the map, but when I try to make a change to the landscape, it disappears, or seems to go completely flat. This happens when I enter landscape mode or if I move the landscape from select mode.

I’ve tried restarting unreal and the computer, as well as resizing the landscape.

Any suggestions would be greatly appreciated.

I b having sane problem… don’t bother starting another project. iv started over 4x now…
iv even tried a small map…