Add all sorts of multimedia elements to your pages with this shortcode pack, comprised of over 30+ different elements.
Go to Settings > CPO Shortcodes and see what the Shortcode Prefix is. This prefix is meant to avoid conflicts with other plugins (in case you have a plugin that also has a --button-- shortcode). Simply make sure the shortcodes you are using correspond to the prefix in there. For example, if your prefix is ct, then you should use the ct_button shortcode. If you have an empty prefix, you can use just button.