I have found a workaround for the problem. The workaround may suggest where the problem lies.
The workaround is: disable drawing on tabs in titlebar; maximise the main window; close Thunderbird; re-enable drawing of tabs in titlebar. Result: Thunderbird will now open maximised. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1265898 Title: thunderbird doesn't remember maximized window state in Ubuntu Gnome To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/1265898/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
