This just happened to me on 13.04, I believe due to unity crashing. Editing sizemode="fullscreen" to "normal" solved the problem too.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/196058 Title: Thunderbird starts in a full-screen mode and cannot be restored To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/196058/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs