Here is my ~/xsession-errors trace :

(gnome-panel:6538): Gtk-WARNING **: gtk_widget_size_allocate(): attempt
to allocate widget with width -9 and height 24

(gnome-panel:6538): Gdk-WARNING **: 
/build/buildd/gtk+2.0-2.14.4/gdk/x11/gdkdrawable-x11.c:878 drawable is not a 
pixmap or window
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 7227 error_code 8 request_code 1 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 --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
Locking assertion failure.  Backtrace:
#0 /usr/lib/libxcb-xlib.so.0 [0x7f6596a469fc]
#1 /usr/lib/libxcb-xlib.so.0(xcb_xlib_lock+0x17) [0x7f6596a46b77]
#2 /usr/lib/libX11.so.6 [0x7f659c3478c0]
#3 /usr/lib/libX11.so.6(XCreateWindow+0x44) [0x7f659c33e704]
#4 /usr/lib/libgdk-x11-2.0.so.0 [0x7f659dfe8b1f]
#5 /usr/lib/libgdk-x11-2.0.so.0(gdk_window_new+0xe) [0x7f659dfb9f8e]
#6 /usr/lib/libgtk-x11-2.0.so.0 [0x7f659e471528]
#7 /usr/lib/libgobject-2.0.so.0(g_closure_invoke+0xbf) [0x7f659c8d81af]
#8 /usr/lib/libgobject-2.0.so.0 [0x7f659c8ed878]
#9 /usr/lib/libgobject-2.0.so.0(g_signal_emit_valist+0x7b8) [0x7f659c8ef608]
#10 /usr/lib/libgobject-2.0.so.0(g_signal_emit+0x83) [0x7f659c8efb33]
#11 /usr/lib/libgtk-x11-2.0.so.0(gtk_widget_realize+0x96) [0x7f659e461b66]
#12 /usr/lib/libgtk-x11-2.0.so.0 [0x7f659e471da8]
#13 /usr/lib/libgobject-2.0.so.0(g_closure_invoke+0x16d) [0x7f659c8d825d]
#14 /usr/lib/libgobject-2.0.so.0 [0x7f659c8ed878]
#15 /usr/lib/libgobject-2.0.so.0(g_signal_emit_valist+0x7b8) [0x7f659c8ef608]
#16 /usr/lib/libgobject-2.0.so.0(g_signal_emit+0x83) [0x7f659c8efb33]
#17 /usr/lib/libgtk-x11-2.0.so.0(gtk_widget_show+0x8c) [0x7f659e462b2c]
#18 gnome-panel [0x44567c]
#19 /usr/lib/libORBit-2.so.0 [0x7f659ea6c21d]

-- 
two xscreens -> gnome panel crashes
https://bugs.launchpad.net/bugs/278261
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