Comment 12 for bug 58232

Could you install libgtk2.0-0-dbg and get a backtrace:
- gdb gnome-terminal
(gdb) break gdk_x_error
(gdb) run
... gdb stop on the break point
(gdb) thread apply all bt

And copy that to a comment. What videodriver do you use? Does it happen with an another user on the same computer?