I am using shs on a taxonomy of vehicle parts with 4 levels: Make/Model/Engine/Year. I am using this to reference to auto parts to purchase with the commerce kickstart drupal installation. I am outputting the product catalog with Views and using the exposed filter setting with simple hierarchical select. Although it builds the filter correctly, and slowly (it's a large taxonomy) when I click to search it doesn't return any items referenced. What can I do? Also if you need more information please let me know.