Problem with update VM 2.0.24c

[velikorodnov]

Hello.
I use multi-language website. Everything had worked fine untill I updated VirtualMart 2.0.24c. The shopping cart and other ajax scripts related to it stoped working properly. When I switch off the System - Language Filte plugin in an admin panel, then everything works. I found out that if in an address line of a browser the language tag is used (index.php/it/), then ajax query returns such line.

<script>document.location.href='http://localhost/index.php/it/?option=com_virtuemart&nosef=1&view=productdetails&task=recalculate&format=json&lang=it&quantity=1&customPrice%5B0%5D%5B9%5D=48&customPrice%5B1%5D%5B21%5D=58&quantity%5B%5D=1&option=com_virtuemart&virtuemart_product_id%5B%5D=6&virtuemart_category_id%5B%5D=1';</script>

It wasn't so before.