Why does my previous background from TCBOTB still show up after I applied the code for a new background from TCBOTB?

Be sure to click edit on the HTML/javascript box that your old background code is in.  Erase this code and paste your new background code in here.  We have found people have two codes in different html/javascript boxes.   Check all your html/javascript boxes on your sidebar and the bottom of your layout page to see if there are any of our background codes in there.