fix for https

app/views/admin/announcements/_form.html.erb

@@ -429,6 +429,9 @@
           processData: false,
           contentType: false
         }).done(function(data){
+          if(window.location.protocol === "https:"){
+            data = data.replace("http:","https:");
+          }
           $('.modal-body iframe').attr('src',data);
           $('#show_preview .modal').modal();
           $('#show_preview .modal').height(function() {