My Buy it Nows are broken, but ONLY in a search result or a By Manufacturer listing. The link doesn't carry the product ID, so when you click it, it comes up 'product not found'. Also, my 'Add to Cart' buttons are broken under all circumstances. After clicking, you go to the cart, but the item is not added.

I'm using easypopulate and Master Products. Any suggestions of where to start looking for the problem would be appreciated!