title: Magento admin product category page not ticking boxes
body: <p>It was a bit difficult to write a title for this so I'll explain in more detail. When I go to manage/create a product and place it in categories by ticking the relevant boxes, then hit save, the product appears to go into the category ok, except the actual tickboxes do not show as ticked after the product has been saved so you can't see which categories the product is already in. This also means I'm unable to take the product out of the category on that page.</p>
  
  <p>Tried upping the memory limit etc but no joy. Thanks in advance for any help :)</p>