Ronald Oussoren <ronaldousso...@mac.com> added the comment: I cannot reproduce the problem on macOS 10.13.3 with python 3.6 (but haven't spent much time on this).
The combination of GUI code with multiprocessing is a known source of problems on macOS, the system libraries are hostile to that. Changing the start method from "fork" to "spawn" or "forkserver" should help with this, using multiprocessing.set_start_method(). This should be changed before doing anything that might Apple system frameworks related to GUIs. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue33111> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
