Sorting products within a category doesn't work when JoomSef is enabled. The problem is that joomsef virtuemart extension doesn't support urls containing the attribute: dir=DESC. For example:
index.php?option=com_virtuemart&dir=DESC&view=category&virtuemart_category_id=174
has the same SEF url like the following one:
index.php?option=com_virtuemart&filter_product=&view=category&virtuemart_category_id=174
Please help. Is it somehow configurable at the backend or needs some code fix from the Artio?