file upload Routing problem

I have the following upload form:

<% form_for @product_datum, :url => { :action => :create }, :html => { :multipart => true } do |form| %>

...

<%= form.file_field :uploaded_data%>

<%= form.submit "Upload" %>

In my controller I have a

def create .. end

For some reason when the user clicks submit, it routes as a GET and sends them to the controller's "index" function. I had this working fine a few days ago, but I am lost as to figuring out why the routing is now messed up.

Thanks

Still having issues. Funny this is if I deploy on a different host uploading works fine.