New shops do not display, and themes/dashboard question

I have Multisite+Marketpress+BuddyPress set up and have been able to setup a main site with products and import items using the sample file.

Now I am trying to test as a new user with a sub-level shop and I have run into the following:

Shop displays a blank page after products are published. Heck, the shop displays a blank page for everything when I go to View Site as the New User.

New users get full access to dashboard/plugins and settings although I am using Branding and Multisite/BuddyPress to try and control access.

New users have access to a lot of theme/shop settings in their shop, including the full USPS settings, etc.
I can't find where to turn all this off for the non-admin users.