not sure this is the same issue as I have had but its a problem with browser security. IE doesnt show anything but when I tried the same thing in Firefox it displayed a security warning.
Cant remember the exact wording but basically it warns you that the frame is not the same as the page you are on so it is blocked to ensure you don't type in your passwords.
I did try a quick search but to be honest gave up.
Sorry cant offer any fixes.