Active menu item being views argument

Firstly, I'm not sure if this is a core menu module issue or an Active menu issue so forgive me if this has been answered or i should post else where.
I have created a menu tree two levels deep. On the second level some of the menu items link to a views page with arguments , ie,
products/audit-information where products is the location of the view and audit-information is the first argument. This argument is a term which is selected when creating a product node. There is at least one node of this type with this term and when i navigate to products/audit-information it appears. My problem is that even though i put products/audit-information at the path that the menu item links to when it is selected the parent branch of the tree collapses! I presume this is because it is a view, i did place menu item pointing to a real node with its own path in the same menu level and this does not collapse the tree, it stays open as expected.
in the first attached image, the menu has opened as expected when clicking on the cross +, then in the second image the menu has collapsed after selecting 'audit information' link, but the view loads as expected and the url is correct. in the third image the correct menu item is active and the node loads as expected.

Q > why does a view with an argument not keep the menu item active even when the views path is correct to the menu item ?

any help leads appreciated.
using D6 / views / cck / jquery update
Thanks
JSP