Named window navigation might fail to navigate the existing named window
This article helps you resolve the problem that you make sure that the target URL and the URL in the target window have the same protection mode setting when calling
Original product version: Internet Explorer
Original KB number: 2961083
When navigating a URL with a target window (such as a form post, a hyperlink, or a
window.open call) and the target window exists, a new window might open instead or the originating window might perform the navigation instead of the target window. The behavior exists on Internet Explorer 8 and above.
This is a problem with Internet Explorer. This can happen if the target url of the new navigation and the url of the existing target window require processes with different integrity levels. In order to be in different integrity levels, they have to be in different security zones having different Protected Mode settings.
Make sure the target URL is in the same integrity level as the url in the target window when calling
window.open. You can do this by making sure the zones that the two windows are in have the same protected mode settings.
If the named window for the navigation target already exists in the same integrity level as that of the originating window, then the navigation to a URL requiring a different integrity level to that named window will occur in the originating window since it can't use the existing window. It does this by creating a new Internet Explorer process swapping the new Internet Explorer process' window in place of the existing Internet Explorer process' window.
If the named window for the navigation target already exists in a different integrity level as that of the originating window, then the navigation to a URL requiring a different integrity level to that named window will occur in a new window since it can't find the target window.
If User Account Control (UAC) is disabled, this problem won't appear in Windows 7 but Windows 8 might still display the behavior since processes are still launched as Medium or Low Integrity level for Internet Explorer.