Hate to say this, but the upgrade to 1:3.18.3-1ubuntu3 the otherday has INTRODUCED a similar bug for me on Ubuntu 16.04 64bit in Gnome fallback metacity session: didn't run across this bug before.
Closing any window (or even closing a save as dialogue etc) crashes all windows in the session and falls back to login. For now, it's probably worth logging into a Gnome fallback Compiz session (or other) if anyone else is experiencing this. :/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1538111 Title: untraceable serious bug in metacity 3.18 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/metacity/+bug/1538111/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs