Corrupted black areas while painting alphas

Schaten

ı am trying to make some height bumps patterns on my object. I create a empty layer. choose an alpha. Disable all other maps but height and normal. everything works fine at first but after putting a few patterns sometime SP creates some stupid black areas on texture randomly. 

Revel

Guess it's somehow related to the post I did before http://polycount.com/discussion/195747/sp-tri-planar-black-normal-projection
I'm guessing if you disable the normal channel the black spot will be gone?

*Also note that on my previous post I mentioned that it only affect tri planar projection, but it seems like sometime even uv projection give the same error even though the chances are pretty small..

Schaten

Tahnk you very much. I didnt face that problem after disabling normal maps while creating patterns with height map.