Apache and PHP returning a blank page on redirect

[cheater512]

On two fresh servers I get a blank page sometimes when a script uses header("Location: url");

Since I've never gotten this before and its a clean install I thought I should try posting it here.

Versions:
net-www/apache-2.0.58
dev-lang/php-5.1.4 (I also tried php 4 briefly to check)

It occured in two scripts, one of my own creation and Cacti.
I traced the problem in Cacti and I hit the redirect to the installer for when Cacti isnt installed.

Interesting to note that a test script (1 liner) I made worked fine.

I havent touched php.ini yet so I'm using Gentoo's default.

Does anyone have any idea?

[js-x.com]

have you checked file permissions? Also the server logs will show (access & error) what you are accessing.

Have you tried two basic scripts:
1) only a redirect command,
2) the redirected to file that says 'hi/test/etc'

Is there some text output before the redirect that is getting printed out?
(A blank line before the <? to start the php)
Header only works if its the first thing before text is send to the client-browser.
_________________
Cheers.

--Mike Robb
http://js-x.com/
[Gentoo: AMD-64 3800, 2gigram, Raid-5 S-ATA + 1 IDE, Radeon-X300-SE(128MB PCIe)]
[Gentoo: P4 dual 3ghz, 1.5gigram, S-ATA + 1 IDE, GeForce 6200 (AGP 8x 128MB)]
[Smoothwall: P3, 256Mram, 1 IDE]

[cheater512]

I did do a 1 line redirect test and it worked fine.

I know that it has to be the 1st thing to be sent but my script has ob_start at the top and Cacti was emerged from portage and it didnt work either.

I packet sniffed it and it returns HTTP/1.1 200 with a Content-Length of 0.
Very strange.