Cannot send mailing to group-Wordpress

I have had no luck getting help with this in the community forum, so am bringing it here.

I have CiviCRM 4.2.0 installed. I am able to send out emails to individuals, but for some reason, cannot send to group. The group has 7 contacts identified within it. After selecting my message template in Step 3 of 5, of creating a new mailing, I hit the "next" button. However, nothing happens. I just get a blank white screen. Turning on debugging did not show anything either. The url at which I get the white screen looks like this: http://www.mysite.org/wp-admin/admin.php?page=CiviCRM&q=civicrm/mailing/send

The group is set up for mailing. When I use Firebug I see that I am getting the following error message when I try to process my mailing to go from step 3 (Mailing Content) to step 4 (Test)

detailed error: The character encoding of the HTML document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the page must to be declared in the document or in the transfer protocol.