Andrea, thank you.  GG is looking at it now.  There is a lot of leaking in textures of OpenGL.  If/when you have time to rerun, it would be helpful if you add the following 2 additional parameters so maybe it will help to pinpoint the texture leak problem.  Also, the color picker in the Sketcher is fixed so try to avoid Ctrl-C and use a normal Quit instead.

Add:
  --num-callers=32      (the default is 12 so texture leaking does not point to far enough to see the problem)
  --leak-check=full

On Sun, Jun 30, 2019 at 2:11 AM Andrea paz <gamberucci.andrea@gmail.com> wrote:
To thank you for the enormous developments you continue to bring, I
have made a "valgrind" that I hope will be useful.
I've played a little with masks, with Gradient and with Sketcher. In
the latter I caused the freeze with the color picker and then I came
out with CTRL+C causing the creation of a dump.
I used as settings in Preferences: Vdpau and OpenGL.
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