add new product, kill body and right sidebar

[Guest]

I have a new install here: http://postersunlimitednola.com/store/

 

Every time I try to add a product, it removes the section on the right with Shopping Cart, Reviews, Languages, Currency. And even though the category will show that a product has been added, when you click on the category - or anything else - nothing is displayed in the body or right of the page.

 

Can anyone make a suggestion on what could be causing this?