The Category Name does not change when I move from one category to the next

I am having a problem. When I use the dropdown in the upper left to choose my category, while I am already viewing a category, it will take me to the other category, but the category name will not change.

For example. I have two categories, CD and MP3. When I first get to my store using the shortcode [mp_list_categories], it shows two small text selections, one for each category. If I click on 'CD' then I will be able to look at the items in the 'CD' category. But, then when I want to switch to the MP3 category using the drop down selector, it will take me to the MP3 category, and show those items, but it will not change the large header text from 'Product Category: CD' to 'Product Category: MP3'

Jason Damisch