Hi John,
I visited your site with IE7 and the image seems to load fine. I can't think of a particular reason why the plugin and IE7 don't play nice together. Are you using any plugin settings that are different from the norm? Perhaps on the visitor-side, they can identify a specific scenario in which there is a problem? (For example — after commenting; or, when entering the wrong word and pressing the Back button?) Or a screenshot? The more information the better.