This fails for me almost every time and in different ways, often with a black display: Xephyr :7 & x=$! sleep 1 DISPLAY=:7 matchbox-window-manager & w=$! sleep 1 DISPLAY=:7 firefox kill $x kill $w I only see the failure on x86_64. It works fine on i686. It works fine everytime if I use metacity instead of matchbox-windows-manager. Thunderbird fails in similar ways. Other apps (like gedit) never fails. It thus seems to be this combination of Xephyr, matchbox and xulrunner that doesn't work, and the bug could be either of the places. It seems to me like matchbox would be the place to start debugging. See also bug 758233 and bug 707021 and bug 681542. matchbox-window-manager-1.2-7.20070628svn.fc15.x86_64 xorg-x11-server-Xephyr-1.11.2-3.fc16.x86_64 xulrunner-8.0-1.fc16.x86_64
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