Redirect problem in IE8 compatibility mode (IE7)

[eluser]wm1i[/eluser]
I generate some similar redirects in my CI app.

It works fine with IE8, Firefox, Safari.

IE7 repeatedly takes the redirect, and does a GET on /index.php instead. I am using
Apache and can see it in the site's access-log.

I have found at least one similar bug report on a vanilla PHP app having the same
issue where header redirects sent to IE7 ended up on the index page instead. The thread
was, alas, from March 2008. This one looks more recent, but same problem.

Any hints appreciated....