#39 Does not update mp3 file even when says it does.

[Lyall Pearce]

Linux, x86_64, Intel CPU. Version 1.5.2, compiled from source (Gentoo Linux)
mp3gain says it updates a file but doesn't.
Even using -t (temp file) has no effect.
Not all files, have not found a common denominator yet.
Chapter 4 of Bram Strokers Dracula from librivox is an example, chapter 4 (downloaded quite some time ago)

lyall@Lyalls-PC ~/Audiobooks/B/Bram_Stoker/Dracula
$ mp3gain -o -c -e -s c test.mp3 
File    MP3 gain    dB gain Max Amplitude   Max global_gain Min global_gain Album gain  Album dB gain   Album Max Amplitude Album Max global_gain   Album Min global_gain
test.mp3    NA  NA  NA  NA  NA  NA  NA  NA  NA  NA
lyall@Lyalls-PC ~/Audiobooks/B/Bram_Stoker/Dracula
$ mp3gain -k -s r -r test.mp3 
test.mp3
Applying auto-clipped mp3 gain change of 0 to test.mp3
(Original suggested gain was 1)
Applying mp3 gain change of 0 to test.mp3...
lyall@Lyalls-PC ~/Audiobooks/B/Bram_Stoker/Dracula
$ mp3gain -o -c -e -s c test.mp3 
File    MP3 gain    dB gain Max Amplitude   Max global_gain Min global_gain Album gain  Album dB gain   Album Max Amplitude Album Max global_gain   Album Min global_gain
test.mp3    NA  NA  NA  NA  NA  NA  NA  NA  NA  NA
lyall@Lyalls-PC ~/Audiobooks/B/Bram_Stoker/Dracula
$ 

Other files, the IDv3 tags are inserted, but some files, they are not.
Files are writable.
They are on an ntfs-3g filesystem but I don't see that having an issue.