I have a similar bug with LibreOffice Writer. Application freezes with following traces in .xsession-errors:
[xcb] Unknown sequence number while processing queue [xcb] Most likely this is a multi-threaded client and XInitThreads has not been called [xcb] Aborting, sorry about that. soffice.bin: ../../src/xcb_io.c :259 : poll_for_event: l'assertion « !xcb_xlib_threads_sequence_lost » a échoué. It seemed to happen randomly (not doing anything special, on time while typing, another time while selecting text), but already 2 times in a week since upgrade to LibreOffice 6.0.7.3. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1801161 Title: soffice.bin: ../../src/xcb_io.c:263: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1801161/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs