Postback with HTML Editor Extender on page causes JavaScript error in IE11

Question

I have added an HTML Editor Extender to the page I'm working on and now ANYTIME I cause a post back on the page I get the following Javascript error:

JavaScript runtime error: Invalid argument.

And nothing happens after that. This works fine in IE10 or below and all other browsers that I'm aware of, however it does not work in IE11 which I need it to work in. Does anyone know of any fixes for this issue?

Answer 1

It looks like it's a known issue with the AjaxToolKit. Try inserting this below the head tag:

<meta http-equiv="X-UA-Compatible" content="IE=10,chrome=1" />