title: Magento custom options 'required' error
body: <p>thanks in advance to any help that anyone is able to offer.
  When a custom option field in magento is set to 'required' it does not add to cart and asks user to select option. However when I uncheck the required option in admin in then works. I think this issue maybe affecting config products so I would like to find a solution other than not use the required option.</p>
  
  <p>Using Magento 1.6</p>
  
  <p>Thank you</p>