Blog preview and comment not working in 3.4.2

I recently (last week) updated my wordpress from version 3.2 to 3.4.2 and now I cannot preview my blog posts. I receive an error message on the page that should show the preview.

I also cannot approve comments without an error message.

The error messages I receive are listed below. It is also showing on the very top of my dashboard.

Warning: Cannot modify header information – headers already sent by (output started at /home/content/b/e/n/bengaged/html/wp-includes/general-template.php:2099) in /home/content/b/e/n/bengaged/html/wp-includes/option.php on line 563

Warning: Cannot modify header information – headers already sent by (output started at /home/content/b/e/n/bengaged/html/wp-includes/general-template.php:2099) in /home/content/b/e/n/bengaged/html/wp-includes/option.php on line 564

Any help would be greatly appreciated.