Comment 11 for bug 711305

Also affects Ubuntu 13.04 (Raring Ringtail) 32-bit. "uname -a" Linux ubuntu 3.9.0-030900rc8-generic #201304211835 SMP Sun Apr 21 22:44:37 UTC 2013 i686 i686 i686 GNU/Linux.

"Thunderbird is already running, but is not responding. To open a new window, you must first close the existing Thunderbird process, or restart your system."