mod_xsendfile; empty files of 2KB each

Hi,

I have problems to use "mod_xsendfile".
It has been installed and configured on my VPS.

I use this in my "download.php" file to force downloads:

header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.$filename);
header('X-Sendfile: '.$filepath);

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The file is downloaded correctly if I use "normal" download methods (readfile etc.).

By using mod_xsendfile I only get 2KB files.
$filepath is correct (worked with old download code, no mod_xsendfile).

This has been added to httpd.conf:

# Turn it on
XSendFile on

# Whitelist a target directory.
XSendFilePath /home/s10hate

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The videos/files are located in this directory:

/home/s10hate/videos/...

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I'm so lost, have used hours trying to find the error, no success :(