Question: problem plot3d does not work

Under maple 2019 (linux ubuntu) I cannot make 3d plots !

Typing

plotd3d(sin(x*y),x=0..2,y=0..0.5);

does not produce any output and also the worksheet does not react any more. The only way to get out is to quit.

Btw: 2d plots work fine ...

What is wrong ? Thank you. Bs regards, Malte.

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