Making sure advertising tags are properly installed.

 

You may verify that the tag is properly integrated on your page by visiting the url of your web page, then looking through the source code where the "Adwit-express" tag is located (do a search with "ctrl+f adwitserver") .
FireFox: View > Page Source
Safari: View > Source Code
Internet Explorer: View > Source


Next, check that the script code is properly located inside the body tags of your page.