I'm presently exporting a Chart and a Grid to a PDF, which works fine in Chrome and Firefox.
In IE11 however, I get:
"SCRIPT5007: Array.prototype.slice: 'this' is null or undefined
File: kendo.all.min.js, Line: 17, Column: 7305 "
It says there is compatibility for this in IE versions 10 and up (I believe).
I've tried it with the proxyUrl, and it still fails in IE.
BUT, this app is running 100% locally and will not have an internet connection anyway, so even if the proxyUrl worked, it wouldn't be a viable solution.