It only seems to be happening on images.
OK:
URL('default', 'item', extension='', args=item.item.slug)
http://pricetack.com/item/us-open-2010-pebble-beach-greg-norman-golf-shirt-x-99
Not OK:
{{=URL('static', 'uploads', extension='', args=item.item.image_thumb)}}
http://pricetack.com/init/static/uploads/item.image.b0e43b99a1d0fea6.494d475f323232322e4a5047_thumb.JPG
Maybe it has to do with 'default' being a controller and 'static' just being
a directory?
