"assertion 'str != NULL' failed" -> if this fails, it implies a string is NULL
so some string is null, let's look at the previous error:
"gconf-value.c: assertion 'value->type == GCONF_VALUE_STRING' failed" -> if this fails somethign which should be a string is not a string (meaning null most likely)
where did this error come from? gconf-value.c : most likely the gconf parsing routines.
your gnome configuration is borked.... if you messed with it by hand, try and fix it, or just get one of the configuration GUIs
]]>[john@metatron ~]$ gnome-font-properties
(gnome-font-properties:1782): GConf-CRITICAL **: file gconf-value.c: line 837 (gconf_value_get_string): assertion `value->type == GCONF_VALUE_STRING' failed
** (gnome-font-properties:1782): CRITICAL **: file fonts.c: line 824 (pango_font_description_from_string): assertion `str != NULL' failed
Any ideas?
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