GTK2.Hscrollbar, GTK2.Vscrollbar, and GTK2.ScrolledWindow were changed to GTK2.HScrollbar and GTK2.VScrollbar. That probably won't work, because the pre-parser converts classes with mixed case into lower case with an underscore in between. So they would be converted to gtk_h_scrollbar and gtk_v_scrollbar, which aren't valid names. GTK2.Hscrollbar gets converted to gtk_hscrollbar, which is valid (gtk_hscrollbar_new, etc).
Those changes should probably be reverted.