IE7 / IFrame's / Link Target incorrectly opening a new window

With IE7 I'm having a problem.  We have a portal that has a navigation menu in an IFrame.  When you click a link, it changes the conent on the main IFrame with the target part of the link.  The problem is, when clicking on the navigation links, the target no longer works when you switch between domains.  

For instance, the first three links I click on in domain 1 stay in the main content window... the fourth link is in another domain, and it also appears in the content window.  From that point on, every link opens in a new window.  This has never been the behavior before, clearly something in IE7 has changed.  Why is this happening and what can I do to avoid it... when I specify a target IFrame I want my content to appear in that IFrame, not a new window (that IFrame does exist also).
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IUFITSAsked:
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rdivilbissCommented:
I see several, apparently similar, yet unresolved questions in the MSDN IE7 forums so it doesn't sound as though an easy answer exists, yet...if you have a public link to this page, I'll take a look.
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IUFITSAuthor Commented:
The site requires a domain username/password to view.  We don't host the main portal page, we only live in IFrame's within it which puts us at a huge loss with this change (since I've been told it's not acceptable to have the user change the browser setting that allows for cross domain IFrame navigation).  I even put a P3P privacy policy on the page which eleviated some problems in IE6.  They're both in the same actual domain (e.g. myschool.edu) but IE looks at the domains much more strickly.

IE7 has been nothing but a head-ache when dealing with anything related to IFrame's in our environment.
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rdivilbissCommented:
Sins of the father....

Due to the abuses of the past, this is the type of knee jerk reaction you will continue to see (not that I'm against improving web security).

I'm certain MS says this is a security enhancement and not a bug.

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