This only seems to occur when mozilla-imagezoom has been installed, so I'm reassigning it to the imagezoom source package. The package version is 0.3.1-0ubuntu4.
** Package changed: thunderbird (Ubuntu) => imagezoom (Ubuntu) -- large empty bar at the bottom https://bugs.launchpad.net/bugs/438189 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
