Cannot Check Boxes in Posts Under Publicize Settings

It looks like there is a misbehaving wp-config.php, plugin, or theme on your site.

If you go to http://www.ericschmidt-photography.com/xmlrpc.php , you’ll see a message saying “XML-RPC server accepts POST requests only.” That’s the correct message. The problem is that there are other elements above the message. This extra space is annoyingly important. It suggests that some plugin, theme, or wp-config.php file in your WordPress has extra “whitespace” (new lines, spaces, tabs, …) before the first “<?php” in the file. This problem is another symptom of a more common problem: the “Headers already sent” problem: http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F

Can you check your wp-config.php, theme files, and plugins for such whitespace?