Pagination not working next page

[yeziddr]

Hi after I update to the new version, 2.0.20b The pagination stop workinghttp://lamina.com.co/productos/tienda-virtual/view/category/virtuemart_category_id/4/,
It work if I change
http://lamina.com.co/productos/tienda-virtual/view/category/virtuemart_category_id/4/start/9
For
http://lamina.com.co/productos/tienda-virtual/view/category/virtuemart_category_id/4?limitstart=9
I'm using joomla 2.5.9
How can I fix that please?

Thank you