Jon,
a couple small icon-related things:
1 when double clicking a guide to open guide dialog, i get
** (inkscape:24066): WARNING **: failed to load icon 'guide_dialog'
2 launch, ctrl+n to open a new window, ctrl+q to quit:
(inkscape:24082): Gtk-CRITICAL **: gtk_size_group_remove_widget:
assertion `GTK_IS_SIZE_GROUP (size_group)' failed