>> Was anybody able to at least reproduce this bug on their system?
>>
>
> Yes, I got the same results
> (Windows XP)

Me too, in beta 25, and verified it works fine in 3.6.
I think it has to do with the use of transform{}. Here's
a modified scene that removes "transforms.inc" from
the minimal scene.

camera {
   location <0,1,-4>
   look_at <0,0,0>
   angle 30
}

light_source {
   <1,1,-1>*10 color rgb 1
}

// inside a union
#declare tube = union {
   cylinder {
      <0,0,0>, <0,1,0>, 0.1
      pigment {
         gradient y
         color_map {
            [0 color <1,0,0>] // red
            [1 color <0,0,1>] // blue
         }
      }
   }
};

// just a cylinder
#declare tube2 = cylinder {
   0, y, 1/10
   pigment {
      gradient y
      color_map {
         [0 color <0,1,0>] // green
         [1 color <1,1,1>] // white
      }
   }
};

// with object in union, red-blue
object {
   tube
   transform {translate <0.25,-0.5,0>}// this transform misaligns texture
}
object {
   tube
   translate <-0.25,-0.5,0>
}

// with cylinder only, green-white
object {
   tube2
   transform {translate <0.5,-0.5,0>}// this tranform works fine
}
object {
   tube2
   translate <-0.55,-0.5,0>
}

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