Sometimes it happens that another plugin (or theme) has a script that conflicts with the advertising plugin and breaks some functions. If that happens the best way to find out is to temporarily deactivate all other plugins, Check if the function does work and if so start re-activating every plugin one by one until you find the conflicting plugin.
If you deactivated all plugins and the problem still occurs you should also switch to a default WordPress theme to check if the conflict comes from your theme.