I have a client who installed CComment on his new site. When attempting to save a comment, the button switches to Saving but stalls. In checking the console I see two alerts:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://liberalfirst.com/?option=com_comment&task=comments.getcomments&format=json&lang=en&contentid=677&component=com_content&start=1. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).

Empty string passed to getElementById().