Testing on the latest releases of ipykernel (5.2.0) and jupyter_client (6.1.2). Issue https://github.com/CadQuery/CQ-editor/issues/123 is gone, but now I get: ``` $ cq-editor Traceback (most recent call last): File "/usr/lib/python3.8/site-packages/cq_editor/widgets/viewer.py", line 162, in display_many context.Display(ais) RuntimeError: Units_NoSuchType BAD LEXICON descriptor Aborted (core dumped) ``` Is this still upstream related?