I'm getting black lines & patches no matter what. :/

Code:

// +FN16 +BS5 +RP4 +RVP +am3 +a0.1 +r512 +ac0.999995 +w800 +h800
// Rendertime 12min 55sek
// Win 8.1Pro x64 on AMD PhenomII with 8 GB ram
#version unofficial patch 3.7;
#patch "upov-reflection-roughness" 0.9;

global_settings{ assumed_gamma 2.2 max_trace_level 36 }

#default{ finish{ ambient 0.1 diffuse 0.7 }}

camera {
 perspective angle 75 location  <0.0 , 1.0 ,-3.0>  right
x*image_width/image_height look_at <0.0 , 1.0 , 0.0>
 aperture 0.025 blur_samples 512,2048 focal_point <0,1.0,0> confidence 0.999
variance 0.001
}

light_source{ < 3000,3000,-3000> color rgb 1 }

sky_sphere { pigment { gradient y
 color_map { [0.00 rgb <0.6,0.7,1.0>][0.35 rgb <0.1,0.3,0.8>][0.65 rgb
<0.1,0.3,0.8>][1.00 rgb <0.6,0.7,1.0>]}
 scale 2 }
}

plane{ <0,1,0>, 0
       texture{ pigment{ checker color rgb<1,1,1>*1.2 color
rgb<0.25,0.15,0.1>*0.05 }
                normal { bumps 0.75 scale 0.1 turbulence 0.5 omega 0.4 lambda
2.5 octaves 6 }
                finish { specular 0.1 roughness 0.1 }
              }
     }

sphere { <0,0,0>, 1.00
         texture {
                   pigment{ color rgb <1,0,0> }
                   finish { specular 1.0 roughness 0.0125 brilliance 2
reflection { 0.5 metallic 0.5 roughness 0.0125 } }
                 }

          scale<1,1,1>  rotate<0,0,0>  translate<0,1.35,0>
       }  // end of sphere -----------------------------------

I would have liked to paste or attach an image here but...
I've tried to vary the +r, the +ac & the number of samples that the
focal blur uses, also the conf & vari, but no success.
The black patches only exist at the horizon while the lines/dots are
on the sphere.

                                   Sincerely Rendering!

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