i had 2 product types, but on this page:http://bestautohaz.hu/_newsite/index.php?page=shop.browse&category_id=7&option=com_virtuemart&Itemid=89
i had only one (both cars has the same product type), that was:
now i set one product to
"Használt autók" - (in english: used cars)
and the other to
"Szalonautó" - (in english: new cars)
and it works for me in this way too...
i don't know...
can you try with 2 product types? (if it won't work for you with 2 product types than the problem is somewhere else...)
can you post a link to your site?
what is your joomla and VM version?
i'm not a php expert but i try to help...
(i won't be online on the next few days, but i try to check the forum as soon as possible)