So, I can report, evereytime I imported a heightmap from file, no matter if I had painted it by myself, or did it with world machine, this issue appeared. And everytime I simply created a level and sculpted heights, I never have this issue.
So, when you say, you have not. I am lost again, what could cause this problem. I have a Please to you, uzumi18. May I have yor map - you talked about - and can have a watchover? If this issue won’t be there, it must depend with the landscape itself. And I have to learn, how to make a landscape without this issue. And if the issue of your map will appear again on my computer, I must consider, it could be because of my AMD graphic card or other hardware depending issues.
Please, let my watch your map, you talked about. Send my a PM with that file. I would be very grateful to you!