Click on Thumbnail, doesn't open Voucher

Created a voucher. Once you click on voucher thumbnail it goes to a new web page like it’s going to open but nothing happens. The loading symbol seems to freeze. Any suggestions?

http://www.macphersonsjewelers.com
Voucher Link: http://www.macphersonsjewelers.com/?voucher=d7d51ec22be9666242cde84f2178f4ff

http://wordpress.org/extend/plugins/voucherpress/