Encrypt button not working

I just added a SSL cert to my website. wp2pgmail works fine with Firefox, but when I use IE using https:// the encrypt button is no longer responsive. When I click it, nothing happens. Any thoughts?

https://wordpress.org/plugins/wp2pgpmail/