Its not supposed to be doing that. It never has on my site and any of the sites I've installed it on.
You can see on includes/templates/your_template/templates/tpl_login_default.php, in the section where the continue button is for guest checkout, it says <?php echo "<a href=\"" . zen_href_link(FILENAME_NO_ACCOUNT, '', 'SSL') . "\">"; ?>
You should have the 'SSL' in there. And in other files like tpl_no_account_default.php it also calls for SSL. The rest of the files used in the COWOA process are the same files used for the regular Zen checkout process, so there should be no difference. Do you have a link to your site????
Also, maybe someone can correct me if I am wrong, but doesn't it give you the secure/unsecure error message if you have unsecure images on https pages? For example, if you are on https://www.yoursite.com/checkout, but you have images showing from http://www.yoursite.com/images/image1.jpg (instead of doing ../images/image1.jpg) you get an error. That has been my experience, but I could be wrong.
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