tsclient's bug #64206 looks related: "About"-window cannot be closed with "close" button https://launchpad.net/distros/ubuntu/+source/tsclient/+bug/64206
-- inactive close button in about dialog https://launchpad.net/bugs/64134 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
