Hi Gabor, I am dealing with the same issue here, and I've opened a ticked for this : http://code.djangoproject.com/ticket/1315
It seems that on the admin's template ('file.html'), filefields are susbtituted to "bound_field.original_url" which evaluates to blank.... even if you use the "bound_field.original_value" it's still doens't work... somehow the admin is appending the url to the model's edit view... I am pretty clueless to what can this be...