As I said in my original post, the two sites are "using the same BuyNow email link." Like this: <?php
$next_url=$_GET['next']; $url = https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=xxxxxxx&return=$next_url";
header($url);?> Actually, the very same piece of code is being executed by use of an "include" statement. So the only difference is, Site_1 does not use frames, Site_2 performs the redirect from within a frame. However, there are differences in browser/PC configurations, and that may be where the problem lies. I do not experience this problem from my PC, but an office-mate does. We have identical PCs, and we both run IE8, but I'm sure we handle cookies and security differently. Any other suggestions on where I should look?
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