I was having a problem that was similar to this developer.
window.opener is undefined on Internet Explorer
In IE10, users were getting an error when accessing a pop-up and then returning because window.opener was null. The pop-up branched out to a third-party website and was then redirected to a URL in the same domain as the parent window.
I had them follow the last solution in this question: to check "Enable Protected Mode" for Trusted sites (which includes the third-party site), and this fixed the issue.
My question is WHY? Why does this work? If anything, I would think that the user would have to uncheck that setting. Is it a question of the settings simply having to match for both the Internet and Trusted sites? And is this specific to IE10?
Any information would be appreciated...thanks!
