I looked at the log file and found this:
[07-May-2011 12:42:19] PHP Warning: require(includes/templates/defend/quick_checkout//google_analytics.php) [<a href='function.require'>function.require</a>]: failed to open stream: No such file or directory in /home/ready20/public_html/includes/templates/MY_TEMPLATE/common/html_header.php on line 80

In digging into the ajax version of FEC ( I didn't install it), I see it redirects to it's over version of the html_header.php file in /includes/templates/MY_TEMPLATE/quick_checkout

Code:
<?php
if ((isset($_REQUEST['request']) && $_REQUEST['request'] == 'ajax') || (isset($_SESSION['request']) && $_SESSION['request'] == 'ajax')) {
// do nothing
//echo '<!-- request = ' . $_REQUEST['request'] . ' -->';
//echo '<!-- session = ' . $_SESSION['request'] . ' -->';
} else {
// not ajax, so load regular file
if (file_exists(DIR_WS_TEMPLATE . 'common/html_header.php')) {
require(DIR_WS_TEMPLATE . 'common/html_header.php');
} else {
require(DIR_WS_TEMPLATES . 'template_default/common/html_header.php');
}
}
?>


No sure I know why it doesn't work but adding the analytics code to the html_header.php file the old fashioned way works, so that's what I did.

Figured I post what I found here in case you can figure what the problem or for others in the same situation.