The result is black, NOT the default texture.

Render the following minimal scene in both 3.6 and 3.7

#default{pigment{checker}} // Make sure that the black
// seen is NOT the default pigment.

difference{
	union{
		box{<0,1,1><2.2,-1,-1>pigment{rgb z}}
		sphere{<-1,0,0>,1.5 pigment{rgb x}}
		}
	box{<-1.3,2,0><1.5,-0.9,-2>}
	cutaway_textures
	translate 4*z
	}

light_source{<0,4,-10> rgb 1}

In 3.6, you get the expected result where you see the pigments of both components.
In 3.7, the cut part is totaly black.
If you comment out cutaway_textures, the default pigment, here set as checker, 
does show.

-- 
Alain
-------------------------------------------------
You know you've been raytracing too long when you even think about using Povray 
for writing letters.
Sven Rudolph (Germany)

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