Version:           1.13 (using KDE 3.5.3, Gentoo)
Compiler:          gcc version 3.4.5 (Gentoo 3.4.5, ssp-3.4.5-1.0, pie-8.7.9)
OS:                Linux (x86_64) release 2.6.16-gentoo-r7

When symbol ~ is pretended to be included in filename, the generated filename will be in a folder it shouldn't be. In my case:

Final Fantasy - The Place I'll Return To Someday ~ Melodies of Life (Final Fantasy IX), where config is: ~/%{extension}/%{albumartist}/%{albumtitle}/%{artist} - %{number} - %{title}.%{extension}.

This file should be in ~/mp3/Final Fantasy/More Friends: music from Final Fantasy/Final Fantasy - The Place I'll Return To Someday ~ Melodies of Life (Final Fantasy IX), but it is placed in ~/mp3/Final Fantasy/Final Fantasy - 11 - The Place I'll Return to Someday/home/(user) Melodies of Life (Final Fantasy IX).mp3
But the file is all OK