Gradient fill not visible in PDF in 80% of all installations
When grading the latest student homeworks where the students had to export a pdf file containing a gradient fill I noticed that lots of students working with Windows 10 produced pdf files where the gradient fill, although visible in the print preview, was not exported into the pdf file.
I started a small survey to find any obvious reasons like to little RAM, but the effect seems to be completely independent from the amount of available memory.
The error does not appear under Linux (0 of 2).
The error does not appear under macOS (0 of 7).
The error does appear in 80% of all Windows 10 installations (44 of 55).
The error does always appear in other Windows versions (4 of 4).
What could cause this effect?
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