This is a strange  issue, so I'll do my best to explain. I'm using Cute Editor to replace the current text editor we are using on our website. So far in testing I've been very happy with it, however part of our website (called admin) requires a user to have a certain level of clearance in order to edit content.

 

The editor itself appears fine here but any buttons on the menu that create a pop up (paste from word, preview etc.) cause the following error message:

 

 Server Error 401: Unauthorized: access is denied due to invalid credentials. 

 

It doesn't look like it's a problem with our web security and has something to do with Cute Editor itself. Any ideas? 

 

Edit: I should probably note that the effects seem to vary from user to user. Those with administrative access only receive this error on one of the pop up menus, while others get this prompt simply when navigating the page.