Zaryin, Does your hair diffuse decal have areas of solid black? When I import a new image to use for a decal, A:M always assigns black as the key color, so any black in your decal won’t be applied to your model. If this is what’s happening in your case, expand the image triangle and right-click/control-click on key color and choose “not set”.
This is the first thing I can think of that may be the problem.
Jim




