Just found what I think is a bug - on sites that specify a 404 Not Found page, the hidden iframe in the Upload form is exposed because the xupload.js file has specified the iframe SRC as "blank.html". I'm not sure if this is the case with everyone, or only certain configurations.
I'm able to fix it by changing "blank.html" to "about:blank" for the two lines that specify it in xupload.js
I'm using Drupal (the PHP-based CMS) is that helps.
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