Can you guys explain THIS?

Miscellaneous Forums/General Discussion/Can you guys explain THIS?

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I said earlier that I coded a shoutbox for a site.
Everybody sees it except the site owner.

The box was brought into the site with a <iframe>.

The owner doesn't see this <iframe> but the thing that happens when <iframe> is not supported by your browser. When I asked her to send me the source coude of her version of the page I discovered that her computer completely removes the entire <iframe> tag before IE can load it. (We didn't try Firefox yet, but considering the kind of the problem, I expect the same).

She has McAfee on her computer and I suggested to shut it down to see what happens. She claims it makes no difrence.

Now I wonder, what is it then?
What could cause a computer remove a <iframe> tag all by itself (and strangely <iframe> tags to other sites are left alone).