Public bug reported: here is the message repeating again and again from the terminal launch, for a folder comparison..
2019-02-13 14:49:57,103 CRITICAL Gtk: _gtk_widget_captured_event: assertion 'WIDGET_REALIZED_FOR_EVENT (widget, event)' failed using xubuntu issue.net: Ubuntu 18.04.2 LTS uname -a: Linux Aspire-E5-771G 4.15.0-45-generic #48-Ubuntu SMP Tue Jan 29 16:28:13 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux ** Affects: meld (Ubuntu) Importance: Undecided Status: New ** Tags: gtk meld -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1815767 Title: Meld spinning with Gtk critical Widget To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/meld/+bug/1815767/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs