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Strange black background displaying on PDF converts using form & API

dynomapper wrote on 2015-02-27:
The API and online form are displaying a black background at the sides.

Please try converting this page:

Any advise that you could give on how to correct this?

dynomapper wrote on 2015-03-02:
Our error in programming. Thanks
echolis wrote on 2015-05-15:
I've experienced this recently as well, specifically with a PNG image with a transparent background. I can provide sample files if needed.
support wrote on 2015-05-19:

The problem could be caused by the fact that the PNG image uses paletted color with alpha. Our software does not fully support this PNG sub-format. The solution is to re-save the image to a non-palette PNG format (true color and alpha).