From comment #8, could it be inferred that this bug is triggered when a menu has variable items in it ? Indeed, adding a bookmark modifies the content of Firefox's bookmark menu. The network menu is constantly modified when new access points are discovered by the WiFi driver. The Skype menu is updated when the status changes. Maybe a hint ?
From comment #8, could it be inferred that this bug is triggered when a menu has variable items in it ? Indeed, adding a bookmark modifies the content of Firefox's bookmark menu. The network menu is constantly modified when new access points are discovered by the WiFi driver. The Skype menu is updated when the status changes. Maybe a hint ?