I've tried many ways already to see if problem is my computer.

I have got the same problem with DirectX 9 (which shows as 8 in GE) and also in Open GL ( both in normal and safe modes.)
This rules out directX problem.

I also deleted cache between each one.
This rules out cache problem.

I've come to conlusion it IS a bug in GE beta.

The ONLY place on GE where this occurs is 0 degrees Longtitude.
It needs other people to try using left and right keyboard cursor keys at heights below 6km on this spot to see if is a beta problem.