WordPress Form Manager issues with IE7 ?

Are there known issues with form manager’s compatibility with IE7?

http://gsipp.com/2011-gsipp-annual-conference/attendee/online-registration-form/

On the fields in which I’ve applied conditions, eg the degrees checkboxes, if someone checks “Other,” then a text field appears below asking them to specify. This works wonderfully in IE8, IE9, Chrome and Firefox. My client cannot get the conditional fields to appear using IE7. She has not tried any other version or any other browser.

Thanks!