"MySQL Server has gone away" is a server issue. See this:
http://www.vbulletin.com/docs/html/t...mysql_goneaway and this:
http://www.vbulletin.com/forum/showt...265#post310265 You will need to talk to your host about this in order to get it resolved. If the host is yourself, I suggest you read up on the error and the variables you will need to try modifying in mysql configuration file to fix this.