This is bug in libwnck not gnome-panel: https://bugs.launchpad.net/ubuntu/+source/libwnck3/+bug/1293252
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-panel in Ubuntu. https://bugs.launchpad.net/bugs/1201095 Title: gnome-panel crashes after launching steam game (Thomas was alone) Status in gnome-panel package in Ubuntu: Invalid Bug description: Hello, I encountered a minor problem on Ubuntu 13.04 with Gnome session in fallback mode. After running the game (even without launching steam application), both gnome panels (upper panel and the bottom one) disappear. I had started gnome-panel manually in the terminal and then launched the game. I received a following message: (gnome-panel:3447): Gdk-ERROR **: The program 'gnome-panel' received an X Window System error. This probably reflects a bug in the program. The error was 'BadMatch (invalid parameter attributes)'. (Details: serial 32189 error_code 8 request_code 62 minor_code 0) (Note to programmers: normally, X errors are reported asynchronously; that is, you will receive the error a while after causing it. To debug your program, run it with the GDK_SYNCHRONIZE environment variable to change this behavior. You can then get a meaningful backtrace from your debugger if you break on the gdk_x_error() function.) Output of apt-cache policy gnome-panel: gnome-panel: Zainstalowana: 1:3.6.2-0ubuntu3 Kandydująca: 1:3.6.2-0ubuntu3 Tabela wersji: *** 1:3.6.2-0ubuntu3 0 500 http://pl.archive.ubuntu.com/ubuntu/ raring/universe i386 Packages 100 /var/lib/dpkg/status and my quick translation: gnome-panel: Version installed: 1:3.6.2-0ubuntu3 Candidate version: 1:3.6.2-0ubuntu3 Table of versions: *** 1:3.6.2-0ubuntu3 0 500 http://pl.archive.ubuntu.com/ubuntu/ raring/universe i386 Packages 100 /var/lib/dpkg/status The game is based on Unity3D engine. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-panel/+bug/1201095/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp