I uploaded a new version of OpenVisus. Please try the TAG=1.2.170 (latest commit in temp branch).
it should solve most of the problems:
(1) it allows you to use the C++ embedded Qt or use the python PyQt5 in case you want to create GUI widgets in python (see python configure.py vs python configure.py --use-pyqt
(2) it's not automatically tested the version uploaded to PyPi. Please see the README (temp branch) for details.
Timo Heister (and every other) can you try? As far as I know it should be a version without any core dump....