It sounds like you have problems with a shader or fog (or both).
But what exactly is wrong is very difficult to say without seeing your scene.
If you send your scene as package to us (support@infinity-code.com), I will try to find the cause of the problem.
To make it clear: I do not need your working project. I need any scene where this problem appears.

In addition, when i use a marker, it gets gray or dissappear if it is not on the center of the map, a little bit to the side, and it's gets all grayish or blank.