This is a known issue in Internet Explorer 7. We're working on a fix for it, but since it's such an old version of Explorer the best and quickest fix we can recommend is to update your browser or use a different one. Visit http://whatbrowser.org to learn how to update your browser and why keeping your browser up to date is a really great idea.
If you're not using Internet Explorer 7, or if you're using a computer on which you cannot upgrade or change browsers, please send us a help ticket with the name and version of the browser and and operating system (Windows, Macintosh, Linux, etc.) you are using and we'll get you squared away in no time.