Hi,
I've got the same problem, I've an embedded report in web app and when I try to browse it by IE 11 I've got Access Denied error and I don't see anything. Using Chrome or Mozilla no problem appears.
It's a security issue of IE which doesn't allow to do cross-domain queries: I've also got the same error including the web site domain name into IE trusted sites and enabling the security option: "start programs and files in a iframe"
Any hints to solve the problem?
Thanks in advance!