same problem here with Safari and Excel Export....
=> Edit this example => Run, first problem IIS Exception.
Okay... cut it down: http://dojo.telerik.com/asUcI/2
Now on Chrome, it works.... on Safari => Cannot POST /result on Dojo, on my server it
ends in a redirect because of the tried post.
The post is actually the failed download of contentType application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
with base64 payload of xlsx file.
Tested with newest Kendo Version + Safari 9+
Should I open a support ticket?