Window List applet conflicts with Mathematica 5.x. Every application window doesn't show up in the window list applet after starting mathematica. Backtrace: $ gdb -p `pidof wnck-applet` GNU gdb 6.3-debian Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i486-linux-gnu". Attaching to process 10757 Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1". warning: could not load vsyscall page because no executable was specified warning: try using the "file" command first Reading symbols from /usr/lib/gnome-panel/wnck-applet...Reading symbols from /us r/lib/debug/usr/lib/gnome-panel/wnck-applet...done. done. Reading symbols from /usr/lib/libpanel-applet-2.so.0...done. Loaded symbols for /usr/lib/libpanel-applet-2.so.0 Reading symbols from /usr/lib/libwnck-1.so.18...done. Loaded symbols for /usr/lib/libwnck-1.so.18 Reading symbols from /usr/lib/libglade-2.0.so.0...done. Loaded symbols for /usr/lib/libglade-2.0.so.0 Reading symbols from /usr/lib/libgnomeui-2.so.0...done. Loaded symbols for /usr/lib/libgnomeui-2.so.0 Reading symbols from /usr/lib/liblpint-bonobo.so.0...done. Loaded symbols for /usr/lib/liblpint-bonobo.so.0 Reading symbols from /usr/lib/libbonoboui-2.so.0...done. Loaded symbols for /usr/lib/libbonoboui-2.so.0 Reading symbols from /usr/lib/libgnome-2.so.0...done. Loaded symbols for /usr/lib/libgnome-2.so.0 Reading symbols from /usr/lib/libgconf-2.so.4...done. Loaded symbols for /usr/lib/libgconf-2.so.4 Reading symbols from /usr/lib/libgtk-x11-2.0.so.0...done. Loaded symbols for /usr/lib/libgtk-x11-2.0.so.0 Reading symbols from /usr/lib/libgdk-x11-2.0.so.0...done. Loaded symbols for /usr/lib/libgdk-x11-2.0.so.0 Reading symbols from /usr/lib/libatk-1.0.so.0...done. Loaded symbols for /usr/lib/libatk-1.0.so.0 Reading symbols from /usr/lib/libgdk_pixbuf-2.0.so.0...done. Loaded symbols for /usr/lib/libgdk_pixbuf-2.0.so.0 Reading symbols from /usr/lib/libgobject-2.0.so.0...done. Loaded symbols for /usr/lib/libgobject-2.0.so.0 Reading symbols from /usr/lib/libglib-2.0.so.0...done. Loaded symbols for /usr/lib/libglib-2.0.so.0 Reading symbols from /lib/tls/i686/cmov/libpthread.so.0...done. [Thread debugging using libthread_db enabled] [New Thread -1223653696 (LWP 10757)] Loaded symbols for /lib/tls/i686/cmov/libpthread.so.0 Reading symbols from /lib/tls/i686/cmov/libc.so.6...done. Loaded symbols for /lib/tls/i686/cmov/libc.so.6 Reading symbols from /usr/lib/libSM.so.6...done. Loaded symbols for /usr/lib/libSM.so.6 Reading symbols from /usr/lib/libICE.so.6...done. Loaded symbols for /usr/lib/libICE.so.6 Reading symbols from /usr/lib/libxml2.so.2...done. Loaded symbols for /usr/lib/libxml2.so.2 Reading symbols from /usr/lib/libz.so.1...done. Loaded symbols for /usr/lib/libz.so.1 Reading symbols from /usr/lib/libgnomecanvas-2.so.0...done. Loaded symbols for /usr/lib/libgnomecanvas-2.so.0 Reading symbols from /lib/libpopt.so.0...done. Loaded symbols for /lib/libpopt.so.0 Reading symbols from /usr/lib/libart_lgpl_2.so.2...done. Loaded symbols for /usr/lib/libart_lgpl_2.so.2 Reading symbols from /usr/lib/libpangoft2-1.0.so.0...done. Loaded symbols for /usr/lib/libpangoft2-1.0.so.0 Reading symbols from /usr/lib/libpangocairo-1.0.so.0...done. Loaded symbols for /usr/lib/libpangocairo-1.0.so.0 Reading symbols from /usr/lib/libfontconfig.so.1...done. Loaded symbols for /usr/lib/libfontconfig.so.1 Reading symbols from /usr/lib/libXinerama.so.1...done. Loaded symbols for /usr/lib/libXinerama.so.1 Reading symbols from /usr/lib/libXi.so.6...done. Loaded symbols for /usr/lib/libXi.so.6 Reading symbols from /usr/lib/libXrandr.so.2...done. Loaded symbols for /usr/lib/libXrandr.so.2 Reading symbols from /usr/lib/libXext.so.6...done. Loaded symbols for /usr/lib/libXext.so.6 Reading symbols from /usr/lib/libXcursor.so.1...done. Loaded symbols for /usr/lib/libXcursor.so.1 Reading symbols from /usr/lib/libXfixes.so.3...done. Loaded symbols for /usr/lib/libXfixes.so.3 Reading symbols from /usr/lib/libpango-1.0.so.0...done. Loaded symbols for /usr/lib/libpango-1.0.so.0 Reading symbols from /usr/lib/libcairo.so.2...done. Loaded symbols for /usr/lib/libcairo.so.2 Reading symbols from /usr/lib/libXrender.so.1...done. Loaded symbols for /usr/lib/libXrender.so.1 Reading symbols from /usr/lib/libX11.so.6...done. Loaded symbols for /usr/lib/libX11.so.6 Reading symbols from /usr/lib/libgnomevfs-2.so.0...Reading symbols from /usr/lib /debug/usr/lib/libgnomevfs-2.so.0.1100.92...done. done. Loaded symbols for /usr/lib/libgnomevfs-2.so.0 Reading symbols from /usr/lib/libbonobo-2.so.0...done. Loaded symbols for /usr/lib/libbonobo-2.so.0 Reading symbols from /usr/lib/libbonobo-activation.so.4...done. Loaded symbols for /usr/lib/libbonobo-activation.so.4 Reading symbols from /usr/lib/libORBit-2.so.0...done. Loaded symbols for /usr/lib/libORBit-2.so.0 Reading symbols from /lib/tls/i686/cmov/libm.so.6...done. Loaded symbols for /lib/tls/i686/cmov/libm.so.6 Reading symbols from /usr/lib/libgmodule-2.0.so.0...done. Loaded symbols for /usr/lib/libgmodule-2.0.so.0 Reading symbols from /lib/tls/i686/cmov/libdl.so.2...done. Loaded symbols for /lib/tls/i686/cmov/libdl.so.2 Reading symbols from /usr/lib/libgthread-2.0.so.0...done. Loaded symbols for /usr/lib/libgthread-2.0.so.0 Reading symbols from /usr/lib/libstartup-notification-1.so.0...done. Loaded symbols for /usr/lib/libstartup-notification-1.so.0 Reading symbols from /usr/lib/libXRes.so.1...done. Loaded symbols for /usr/lib/libXRes.so.1 Reading symbols from /usr/lib/libpangoxft-1.0.so.0...done. Loaded symbols for /usr/lib/libpangoxft-1.0.so.0 Reading symbols from /usr/lib/libpangox-1.0.so.0...done. Loaded symbols for /usr/lib/libpangox-1.0.so.0 Reading symbols from /usr/lib/libgnome-keyring.so.0...done. Loaded symbols for /usr/lib/libgnome-keyring.so.0 Reading symbols from /usr/lib/libjpeg.so.62...done. Loaded symbols for /usr/lib/libjpeg.so.62 Reading symbols from /usr/lib/liblaunchpad-integration.so.0...done. Loaded symbols for /usr/lib/liblaunchpad-integration.so.0 Reading symbols from /usr/lib/libesd.so.0...done. Loaded symbols for /usr/lib/libesd.so.0 Reading symbols from /usr/lib/libaudiofile.so.0...done. Loaded symbols for /usr/lib/libaudiofile.so.0 Reading symbols from /lib/ld-linux.so.2...done. Loaded symbols for /lib/ld-linux.so.2 Reading symbols from /usr/lib/libfreetype.so.6...done. Loaded symbols for /usr/lib/libfreetype.so.6 Reading symbols from /usr/lib/libexpat.so.1...done. Loaded symbols for /usr/lib/libexpat.so.1 Reading symbols from /usr/lib/libpng12.so.0...done. Loaded symbols for /usr/lib/libpng12.so.0 Reading symbols from /usr/lib/libXau.so.6...done. Loaded symbols for /usr/lib/libXau.so.6 Reading symbols from /usr/lib/libXdmcp.so.6...done. Loaded symbols for /usr/lib/libXdmcp.so.6 Reading symbols from /usr/lib/libgnutls.so.11...done. Loaded symbols for /usr/lib/libgnutls.so.11 Reading symbols from /lib/tls/i686/cmov/libresolv.so.2...done. Loaded symbols for /lib/tls/i686/cmov/libresolv.so.2 Reading symbols from /lib/tls/i686/cmov/librt.so.1...done. Loaded symbols for /lib/tls/i686/cmov/librt.so.1 Reading symbols from /usr/lib/libORBitCosNaming-2.so.0...done. Loaded symbols for /usr/lib/libORBitCosNaming-2.so.0 Reading symbols from /usr/lib/libXft.so.2...done. Loaded symbols for /usr/lib/libXft.so.2 Reading symbols from /usr/lib/libasound.so.2...done. Loaded symbols for /usr/lib/libasound.so.2 Reading symbols from /usr/lib/libtasn1.so.2...done. Loaded symbols for /usr/lib/libtasn1.so.2 Reading symbols from /usr/lib/libgcrypt.so.11...done. Loaded symbols for /usr/lib/libgcrypt.so.11 Reading symbols from /usr/lib/libgpg-error.so.0...done. Loaded symbols for /usr/lib/libgpg-error.so.0 Reading symbols from /lib/tls/i686/cmov/libnsl.so.1...done. Loaded symbols for /lib/tls/i686/cmov/libnsl.so.1 Reading symbols from /lib/tls/i686/cmov/libnss_compat.so.2...done. Loaded symbols for /lib/tls/i686/cmov/libnss_compat.so.2 Reading symbols from /lib/tls/i686/cmov/libnss_nis.so.2...done. Loaded symbols for /lib/tls/i686/cmov/libnss_nis.so.2 Reading symbols from /lib/tls/i686/cmov/libnss_files.so.2...done. Loaded symbols for /lib/tls/i686/cmov/libnss_files.so.2 Reading symbols from /usr/lib/X11/locale/common/xlcUTF8Load.so.2...done. Loaded symbols for /usr/lib/X11/locale/common/xlcUTF8Load.so.2 Reading symbols from /usr/lib/gconv/ISO8859-1.so...done. Loaded symbols for /usr/lib/gconv/ISO8859-1.so Reading symbols from /usr/lib/gtk-2.0/2.4.0/engines/libclearlooks.so...done. Loaded symbols for /usr/lib/gtk-2.0/2.4.0/engines/libclearlooks.so Reading symbols from /usr/lib/gtk-2.0/2.4.0/loaders/libpixbufloader-png.so...don e. Loaded symbols for /usr/lib/gtk-2.0/2.4.0/loaders/libpixbufloader-png.so 0xb79fd327 in g_static_rw_lock_writer_lock () from /usr/lib/libglib-2.0.so.0 (gdb) thread apply all bt Thread 1 (Thread -1223653696 (LWP 10757)): #0 0xb79fd327 in g_static_rw_lock_writer_lock () from /usr/lib/libglib-2.0.so.0 #1 0xb7a5e1b5 in g_type_init_with_debug_flags () from /usr/lib/libgobject-2.0.so.0 #2 0xb7a5e412 in g_type_init () from /usr/lib/libgobject-2.0.so.0 #3 0xb7f622a7 in wnck_window_get_type () from /usr/lib/libwnck-1.so.18 #4 0xb7f62865 in wnck_window_get_transient () from /usr/lib/libwnck-1.so.18 #5 0xb7f5ec10 in wnck_tasklist_get_size_hint_list () from /usr/lib/libwnck-1.so.18 #6 0xb7a51ab3 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0 #7 0xb7a463a8 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0 #8 0xb7a54b13 in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0 #9 0xb7a56150 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0 #10 0xb7a564c3 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0 #11 0xb7f5991d in wnck_screen_get_default () from /usr/lib/libwnck-1.so.18 #12 0xb7f59f9e in wnck_screen_get_default () from /usr/lib/libwnck-1.so.18 #13 0xb7f5af07 in wnck_screen_get_default () from /usr/lib/libwnck-1.so.18 #14 0xb79e26f0 in g_child_watch_add () from /usr/lib/libglib-2.0.so.0 #15 0xb79e048e in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0 #16 0xb79e3496 in g_main_context_check () from /usr/lib/libglib-2.0.so.0 #17 0xb79e3783 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0 #18 0xb74a1590 in bonobo_main () from /usr/lib/libbonobo-2.so.0 #19 0xb749faab in bonobo_generic_factory_main_timeout () from /usr/lib/libbonobo-2.so.0 #20 0xb749fb2f in bonobo_generic_factory_main () from /usr/lib/libbonobo-2.so.0 #21 0xb7f7a314 in panel_applet_factory_main_closure () from /usr/lib/libpanel-applet-2.so.0 #22 0xb7f7a3e6 in panel_applet_factory_main () from /usr/lib/libpanel-applet-2.so.0 #23 0x0804cb8f in main (argc=-1213778056, argv=0xb7a73778) at wncklet.c:225 #0 0xb79fd327 in g_static_rw_lock_writer_lock () from /usr/lib/libglib-2.0.so.0 (In reply to comment #1) > Thanks for your bug. I'm changing the setting because mathematica is not shipped > by ubuntu. What version of the distribution do you use? Can you get a backtrace > of the hang with libgnomevfs-2-dbg and gnome-panel-dbg installed? You can use > that to get it: > - gdb -p `pidof wnck-applet` > (gdb) thread apply all bt > > Could you remove the windows list and the desktop switcher applet to note which > one do this?