Showing heavyweigth pulldown menu from menu bar is always at one point on Linux/Gnome/Sawfish configuration.

1) Have some app with menu bar with more than one menu's.
2) Select one menu using mouse, the pulldown menu appears as it should be.
(remember the pulldown has to be heavyweigth).
3) Move with mose to another menu
4) the pulldown remains at the same position, although its items are reflecting
the change.
 
It is possible to see in Issuezilla #17592