Marketpress activated, products created and displayed .. but no tables show in database

Hi, I don't see wp_mp_products and other MP tables in my database, even though it is activated and I have working products which have been test purchased successfully.

I even tried fresh install of both WP and MP on new site but no success. I have a working version of MP with database tables from a site I created several months ago but I forget if there were any special steps I need to take.

Ideas??