J'ai activé l'option LooseBinding de Compiz Fusion Icon
et depuis je n'ai plus la "decoration" de mes fenêtres ...
j'ai beau desactiver l'option ou remettre les parametre par defaut (rename ~/.config/.compiz)
avec un gtk-window-decorator --replace
(gtk-window-decorator:4946): Gdk-WARNING **: Using Cairo rendering requires the drawable argument to
have a specified colormap. All windows have a colormap,
however, pixmaps only have colormap by default if they
were created with a non-NULL window argument. Otherwise
a colormap must be set on them with gdk_drawable_set_colormap
(gtk-window-decorator:4946): Gdk-WARNING **: Using Cairo rendering requires the drawable argument to
have a specified colormap. All windows have a colormap,
however, pixmaps only have colormap by default if they
were created with a non-NULL window argument. Otherwise
a colormap must be set on them with gdk_drawable_set_colormap
(gtk-window-decorator:4946): GLib-GObject-CRITICAL **: g_object_get_qdata: assertion `G_IS_OBJECT (object)' failed
(gtk-window-decorator:4946): Gdk-CRITICAL **: gdk_colormap_get_visual: assertion `GDK_IS_COLORMAP (colormap)' failed
(gtk-window-decorator:4946): Gdk-CRITICAL **: gdk_visual_get_screen: assertion `GDK_IS_VISUAL (visual)' failed
avec emerald --replace
(emerald:4950): GLib-GObject-CRITICAL **: g_object_ref: assertion `G_IS_OBJECT (object)' failed
ça m'apprendra a vouloir touchez n'importe quoi ....

bon si quelqu'un a une idee : elle est la bienvenue !!