I also can't get a "preview", but as you all said, it's not a major problem.
"The following error or errors occurred while posting this message:
The message body was left empty".
This error-message occurs when someone tries to post a message containing one or more links that the forum rejects or considers as threats.
When I get that error ^^ I remove the beginning of the link:
http: //www.So instead of leaving the link as it is: http: //www. michaeljacksonhoaxforum . com
I leave only: michaeljacksonhoaxforum. com