From the tests I did at txcas site, I can say the code is broken for any browser I was able to test when minification is on. Turning off minification fixes the issue (at least here on linux, no idea on iOS 10).
Now, why that?
No idea.
What I've observed is that for some reason, an uncompressed version of sceditor is present in the hive that I got, with some notes:
// ==ClosureCompiler==
// @output_file_name jquery.sceditor.min.js
// @compilation_level SIMPLE_OPTIMIZATIONS
// ==/ClosureCompiler==
/*jshint smarttabs: true, scripturl: true, jquery: true, devel:true, eqnull:true, curly: false */
/*global Range: true, browser*/
But, AFAIK, it's been a while since we have added the unminified version of the editor, so I'm not sure where it comes from.
First thing I would suggest is to remove via ftp (or cli) all the files starting with "hive" present in the cache directory.