Mathematica crashes when plotting over region

Mathematica 12.0.0 crashes and kernel quits on my computer (Win 10) when I try the simple exercise of plotting over a region (taken from this Wolfram page):

Plot3D[x y, {x, y} \[Element]  Disk[{0, 0}, 1], ImageSize ->  500,  PlotTheme -> "Web"] 

A similar problem happens when I work with StreamPlot over a Disk region.

Any advice on how to stop this from happening?