Very likely this review goes to those who sold you the template. :) To our defense, many users (from beginners to experts) have successfully set up sigplus on their website, and sigplus has proved to be compatible with a wide range of templates. Since in the Joomla architecture the template has the last word in what final output is produced, an ill-written template can render any other extension inoperable. An example of such aggressive behavior where the template is removing script references added by sigplus (or any other extension) is included in the sigplus FAQ (with a recommended solution). However, if you strongly believe that there is a fault in sigplus, feel free to contact the developer; the issue you will have raised will be addressed without much delay.