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MdC code like
won't render correctly in PDF output, with "gray" shading (you should get a shaded owl, and you get a gray square).
This code is made with a owl sign, with a shading sign from the "shading symbol" menu over it.
The problem is that in the PDF output, I avoid transparency (for preserving CMYK colours), and the gray square is drawn over the owl.
Note that the other shading systems, quadrant based or sign based, don't have this problem.
I will fix this problem when possible.
Solved in version 5.7 for free groups, which were the actual problem pointed out to me: shading is always placed below the rest (forgot to test it for m##//).
A possible solution is to draw the shading first, like this : //##m, or to use other kinds of shadings (the quadrant shading and the "sign" menu shading work fine).