Got this reply from Answers.com support. Apparently, the plugin won't work with Internet Explorer.
Thank you for contacting Answers.com.
We appreciate you bringing this to our attention. Your message has been passed on to our WordPress liason for processing. Thanks for your input.
We have found that your issue only occurs in Internet Explorer, you can drag and drop in Firefox. If you'd like to install Firefox, you can download it at: http://www.mozilla.com/firefox .
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