A family of Microsoft relational database management systems designed for ease of use.
That is typical form/subform behavior (seeing the blank rectangle in design view) as it normally happens when you have the main form open and then perhaps do something with it and then go to design view. The way to ensure it always opens with the subform showing is to just close the form and then reopen in design view.
As for the subform not showing anything, that will happen if the record source the subform has does not have any records to return and the record source is non-updatable so therefore you can't add any records through the form. The key to fixing that is to make sure you have AllowAdditions and AllowEdits set to yes for the main form and subform and then make sure your query underlying the subform is updatable. See here for why a query is made non-updatable:
http://allenbrowne.com/ser-61.html
Bob Larson, Former Access MVP (2008-2010) http://www.btabdevelopment.com (free Access tools, tutorials, and samples)