I'm finding that Shape Builder operations frequently crash my Designer 2.0 system out to the OS (Windows 10).
Hopefully you can repeat the problem:
Open the attached file.
Select the Inks and Shapes layer.
Click the Shape Builder tool.
Start building shapes. For example, I just built shapes to try to make one shape out of the right arm and to attempt to add the circles into the pants where they intersect.
Anecdotally I have the impression that if I reboot the PC, I can resume work for a little while longer than if I just start up Designer again. Memory leak, perhaps?
lucy drawing.afdesign