Top level menu linked to content, selection of top level link from a submenu expands the menu but does not display the link

With both Accordion menu 7.x-1.0+2-dev and 7.x-1.1, Drupal core 7.14 and Zen 7.x-5.1
jQuery Update jQuery 1.5.2 and jQuery UI 1.8.11

Set up for Accordion:
checked: Header link If checked, header menu items will be output as links. Clicking on the menu item may trigger the accordion effect and a redirect to the header link. Undesirable
Event: mousedown

The Accordion menu has 2 levels - top and sub level content.
Selecting another top level menu item when on another top level item works as expected: expand the menu and display the linked content

Selecting a top level menu item when on a sub menu, expands the menu, but the linked content is not displayed. The top level menu item must be selected again for the link to work.

The behavior is present on Firefox 13.0.1, IE and Chrome 20.0.1132.57