virtualbox on ubuntu 11.04 32bit

Question

ubuntu

Virtualbox stopped starting. At work 64bit everything is ok. Can you tell me what could be?
~$ virtualbox

(:29368): Gtk-WARNING **: Error loading theme icon 'dialog-warning' for stock: Error opening file: No such file or directory

(:29368): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed

** (:29368): CRITICAL **: equinox_style_draw_render_icon: assertion `base_pixbuf != NULL' failed

(:29368): Gtk-CRITICAL **: IA__gtk_style_render_icon: assertion `pixbuf != NULL' failed

(:29368): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_pixels: assertion `GDK_IS_PIXBUF (pixbuf)' failed

(:29368): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_width: assertion `GDK_IS_PIXBUF (pixbuf)' failed

(:29368): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_height: assertion `GDK_IS_PIXBUF (pixbuf)' failed
Segmentation fault

Answer 1

A little googling led me here: forums.virtualbox.org/viewtopic.php?f=7&t=32752 I'll translate
it in short: "Install qtconfig-qt4 and select an engine other than QGtkStyle." Try this option.

Answer 2

Launched on the standard gnome design - everything works.
I don't see any errors