Thanks for the reply, Marina!  Yes, I have upgraded to 15.1 recently.  I am using version 15.1.20151.2123 and when I run in IE 10 I get the "SCRIPT5: Access is denied" error.  The same code works fine in IE 11 and in Firefox.  All of the aforementioned is in our development environment.

The previous version of Infragistics (Infragistics4.WebUI.WebHtmlEditor.v13.1) that is currently being used in our production environment works fine in IE 10 as well. 

I will take a look at my controls and also see if I can get a sample together for you.

Hello Matt,

Thank you for using our community.

Let me repeat your question, so that I can be sure that I understand your it correctly. You have upgraded to 15.1 version of our controls (could you tell me the exact version you are using?) and when you run your project under IE 10 an error accurse.

I have created a simple sample with only one WebHtmlEditor and it is working fine under IE 10. What is more the references are automatically added to your project when you drag the control to the form. And if you go to design mode in VS you will automatically load the styles for the WebHtmlEditor (including the images). The styles path might be different from the old versions of the controls that you were using.

Please give me information about the exact version of the controls you are using (ex are you using the latest service release?) and if possible send me a working sample so I can further investigate your case.