Looks like Datepicker 2.3.2 is causing the problems. You could write to the developer of the Contact Form 7 Datepicker plugin or post the issue in the support forum for that plugin - http://wordpress.org/support/plugin/contact-form-7-datepicker.
Contact Form 7 has some Datepicker support via the new HTML5 date input type (see http://contactform7.com/date-field/) but this is currently only supported on some browsers - see http://www.wufoo.com/html5/types/4-date.html
Text field may your best option at this stage.