Thanks for the info, but I botched the original post because I forgot to
comment out the culprit line. The .pov file is

box { < -0.5, 0.0, 0.0 > < 0.0, 8.0, 9.0 > texture {pigment { color < 1.0,
1.0, 0.8 > }}}
//box { < -0.5, 0.0, -0.5 > < 7.5, 9.0, 0.0 > texture {pigment { image_map {
jpeg "terracotta5.jpg"} }}}
light_source {< 3.5, 4.0, 7.0 > color < 1.0, 1.0, 1.0 >}
camera { perspective right x*-2/3 sky z angle 50 location < 3.0, -8.0, 6.0 >
look_at < 3.0, 7.0, 6.0 >}

and what I'm asking is why does the presence of the commented out line
affect the generation of the png. Thanks!

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