module not displaying on all pages

[ronin75]

hi
i have joomla 1.7.2 installed with virtuemart 1.9.8M. Both the currency converter module and the cart does not display on the product pages only on the category page. any ideas why that would be. i need it to display through out the checkout process. i have changed the module settings from 'only display on these pages' to 'display on all pages except these...' and still it makes no difference. could anyone please point me in the right direction.
thanks