Volume applet crashes and can't change icon theme

[Lucabuntu]

After the update of today volume applet crash on startup, power manager doesn't display battery settings and i can't change the icon theme (that now is like the root theme).

Using Inrepid Ibex 8.10

[']['he']['wice (thetwice)]

Also several gtk applications (e.g. rhythmbox, pidgin) quit with this message:

~$ pidgin
/home/twice/.gtkrc-2.0:7: Impossibile trovare il file da includere: ".gtkrc-2.0-gnome-color-chooser"

ERROR: Caught a segmentation fault while loading plugin file:
/usr/lib/gstreamer-0.10/libgstlibvisual.so

Please either:
- remove it and restart.
- run with --gst-disable-segtrap and debug.

~$ pidgin --debug
(20:23:44) prefs: Reading /home/twice/.purple/prefs.xml
(20:23:44) prefs: Finished reading /home/twice/.purple/prefs.xml
(20:23:44) prefs: purple_prefs_get_string: /pidgin/browsers/command not a string pref
(20:23:44) dbus: okkk
(20:23:44) plugins: probing /usr/lib/pidgin/gevolution.so
(20:23:44) plugins: probing /usr/lib/pidgin/notify.so
(20:23:44) plugins: probing /usr/lib/pidgin/timestamp_format.so
(20:23:44) plugins: probing /usr/lib/pidgin/spellchk.so
(20:23:44) plugins: probing /usr/lib/pidgin/nautilus.so
(20:23:44) plugins: probing /usr/lib/pidgin/musicmessaging.so
(20:23:44) plugins: probing /usr/lib/pidgin/convcolors.so
(20:23:44) plugins: probing /usr/lib/pidgin/extplacement.so
(20:23:44) plugins: probing /usr/lib/pidgin/cap.so
(20:23:44) plugins: probing /usr/lib/pidgin/sendbutton.so
(20:23:44) plugins: probing /usr/lib/pidgin/pidginrc.so
(20:23:44) plugins: probing /usr/lib/pidgin/gtkbuddynote.so
(20:23:44) plugins: probing /usr/lib/pidgin/history.so
(20:23:44) plugins: probing /usr/lib/pidgin/timestamp.so
(20:23:44) plugins: probing /usr/lib/pidgin/iconaway.so
(20:23:44) plugins: probing /usr/lib/pidgin/gestures.so
(20:23:44) plugins: probing /usr/lib/pidgin/xmppconsole.so
(20:23:44) plugins: probing /usr/lib/pidgin/markerline.so
(20:23:44) plugins: probing /usr/lib/pidgin/ticker.so
(20:23:44) plugins: probing /usr/lib/purple-2/newline.so
(20:23:44) plugins: probing /usr/lib/purple-2/libzephyr.so
(20:23:44) plugins: probing /usr/lib/purple-2/libqq.so
(20:23:44) plugins: probing /usr/lib/purple-2/libjabber.so
(20:23:44) plugins: /usr/lib/purple-2/libjabber.so is not usable because the 'purple_init_plugin' symbol could not be found. Does the plugin call the PURPLE_INIT_PLUGIN() macro?
(20:23:44) plugins: probing /usr/lib/purple-2/libirc.so
(20:23:44) plugins: probing /usr/lib/purple-2/libsimple.so
(20:23:44) plugins: probing /usr/lib/purple-2/tcl.so
(20:23:44) plugins: /usr/lib/purple-2/tcl.so is not loadable: libtcl8.4.so.0: impossibil...