Podcast episodes won't download in iTunes app (but works fine on desktop)

Question

Hi, I can't figure this out:
Our podcast episodes simply won't download in the iTunes app on iPhone. The download simply stops at 10.3 kB (or sometimes at another value), without really getting started at all.
This is very odd, since downloads are working fine in iTunes on the desktop, and in other apps on the phone (such as Instacast).
Here's the iTunes-page for the podcast:
http://itunes.apple.com/no/podcast/filmfrelst/id303539607?l=nb
And here's the RSS feed URL:
http://montages.no/filmfrelst_files/rss.php
(The podcast is called "Filmfrelst", and is searchable in the iTunes app)
Any clues?

Answer 1

OK, seems like I located the problem - sort of.  It's not the feed that's the issue, but rather the fact that I'm pushing my MP3-files through a PHP script which does some statcounting. If I access the MP3 files directly, the iTunes app downloads them OK.
So I'm guessing maybe my headers aren't exactly what the iTunes app is expencting? Here's a snippet from the PHP file which outputs the MP3 data:
header('Content-Type: audio/mp3');
header('Content-Length: 'filesize($location));
@readfile($location);