Editor does not save in IE11?

Hi everybody,
as described and demonstrated in detail by Clancycoop
(https://datatables.net/forums/discussion/comment/183225#Comment_183225),
Testcase http://live.datatables.net/zuxusose/1/edit
Editor in IE11 (under certain circumstances?) does not save edited content, nor throws an error - it just hangs up. (The piece works well with modern browsers).
It seems to be a rare situation, because nobody commented but me - or is it a bug / oddity, already recognized by the datatables team?
Best regards, Robert