#27 Couldn't reset permissions

[Anonymous]

I've written a rudimentary PHP-Frontend for id3v2 to manage my
MP3-Files on my local file-server.

When I try to retag MP3-Files which aren't owned by www-data
(the default Debian Apache-User), the following error is displayed
in Apaches error.log:

--
Couldn't reset permissions on '/multimedia/Music/Artists/Britney
Spears/Britney Spears - In The Zone/Britney Spears - 06 -
Toxic.mp3'
--

I think I've set the proper permissions through chmod:

--
-rwxrwxrwx 1 mario mario 4034560 Aug 10 11:59 Britney Spears
- 06 - Toxic.mp3
--

Why should id3v2 not be able to write to files on which Others
have permission to write to?

Thanks for your help
Mario