Comment 8 for bug 959570

New similar errors...
I'll try to remove the spinner, run the program again and see if it works. Please look the following file for programming errors:
http://bazaar.launchpad.net/~bashkaraoke-dev/bashkaraoke/bashkaraoke-gtk/view/head:/src/bashkaraoke-gtk-new.py

ERRORS:
(bashkaraoke-gtk-new.py:407): Gtk-CRITICAL **: _gtk_css_value_ref: assertion `value != NULL' failed

(bashkaraoke-gtk-new.py:407): Gtk-CRITICAL **: _gtk_css_value_ref: assertion `value != NULL' failed

(bashkaraoke-gtk-new.py:407): Gtk-CRITICAL **: _gtk_css_value_ref: assertion `value != NULL' failed

(bashkaraoke-gtk-new.py:407): Gtk-CRITICAL **: _gtk_css_value_ref: assertion `value != NULL' failed

(bashkaraoke-gtk-new.py:407): Gtk-CRITICAL **: _gtk_css_value_ref: assertion `value != NULL' failed

(bashkaraoke-gtk-new.py:407): Gtk-CRITICAL **: _gtk_css_value_ref: assertion `value != NULL' failed

(bashkaraoke-gtk-new.py:407): Gtk-CRITICAL **: _gtk_css_value_ref: assertion `value != NULL' failed

(bashkaraoke-gtk-new.py:407): Gtk-CRITICAL **: _gtk_css_value_ref: assertion `value != NULL' failed

(bashkaraoke-gtk-new.py:407): Gtk-CRITICAL **: _gtk_css_value_ref: assertion `value != NULL' failed

(bashkaraoke-gtk-new.py:407): Gtk-CRITICAL **: _gtk_css_value_ref: assertion `value != NULL' failed

(bashkaraoke-gtk-new.py:407): Gtk-CRITICAL **: _gtk_css_value_ref: assertion `value != NULL' failed
Errore di segmentazione (core dump creato)

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(bashkaraoke-gtk-new.py:15205): Pango-WARNING **: shaping failure, expect ugly output. shape-engine='BasicEngineFc', font='Ubuntu Light 60', text=''

(bashkaraoke-gtk-new.py:15205): Pango-CRITICAL **: pango_layout_is_wrapped: assertion `layout != NULL' failed

(bashkaraoke-gtk-new.py:15205): Pango-CRITICAL **: pango_layout_is_ellipsized: assertion `layout != NULL' failed
/usr/lib/python2.7/dist-packages/gi/types.py:43: Warning: g_object_ref: assertion `G_IS_OBJECT (object)' failed
  return info.invoke(*args, **kwargs)

(bashkaraoke-gtk-new.py:15205): Pango-CRITICAL **: pango_layout_get_extents: assertion `layout != NULL' failed

(bashkaraoke-gtk-new.py:15205): Pango-CRITICAL **: pango_layout_get_context: assertion `layout != NULL' failed

(bashkaraoke-gtk-new.py:15205): Pango-CRITICAL **: pango_context_get_language: assertion `context != NULL' failed

(bashkaraoke-gtk-new.py:15205): Pango-CRITICAL **: pango_context_get_metrics: assertion `PANGO_IS_CONTEXT (context)' failed

(bashkaraoke-gtk-new.py:15205): Pango-CRITICAL **: pango_font_metrics_get_ascent: assertion `metrics != NULL' failed

(bashkaraoke-gtk-new.py:15205): Pango-CRITICAL **: pango_font_metrics_get_descent: assertion `metrics != NULL' failed