problem with iceweasel 4 beta 2 (firefox-bin:2646)

[imagen.patagonica at gmail.com]

iceweasel 4 beta 2 puts the following error:
$ iceweasel

(firefox-bin:2646): Gtk-WARNING **:
/build/buildd-gtk+2.0_2.20.1-1-i386-Ixfflh/gtk+2.0-2.20.1/gtk/gtkwidget.c:9888:
widget class `GtkMenuBar' has no property named `window-dragging'


iceweasel 4 beta 2 will not let you install firefox language pack 4 beta 2
or beta 3. Clarified that iceweasel 4 beta 1 no problen.

debian sequeeze gnome 2.30.2


regards
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