Hi Mike,
Its because you are running the trial version. The limitations of the cart trial version are as follows:
Limits the display to 7 products with navigation (first, prev, next, last) disabled on product listing page
Displays a small trial message at the bottom of the screen
Expires in 30 days
Other than that it is a fully functional cart that can checkout and process credit cards.
If you have already purchased a license you can submit your license request here http://www.smith-consulting.com/forums/licenserequest.aspx
Thanks,