bug iOS7 you work for

Now、We are currently developing a version of Walking Player compatible with iOS7 flat GUI.、In such a situation, I found a problem with the standard music app.、I'll summarize it。
This is a problem under special conditions.、If you are having trouble with strange behavior、I hope this article is helpful.。

[Problem description]
in my music library、Contains the following album called "BJ Special Track"。

This album is a little different from others.、The point is that the album contains a mixture of multiple genres.。generally、1All songs in one album are from the same genre.。The problem occurs when、When there are multiple genres in one album like this。
(This album is、I'm sure a long time ago、It was included as a free sample in some computer or app.、Perhaps many people have it unconsciously.)

Problem generating operation
After stopping/restarting the music app、[Genre]-[Ethnic]If you choose、as below screen[BJ Special Track]Ethnic genres in the album said that during[BJ Special-Ethnic-]Only the songs will be narrowed down and displayed.。this is the correct display。(``5 songs、1minute” is displayed.、I think it's strange that the playback time is 1 song, but the number of songs is 5 songs from the entire album.、This is not a big problem and is a separate issue from this issue, so I will close my eyes.。)

Subsequently、[Album]-[BJ Special Track]If you choose、as below screen[BJ Special-Ethnic-]Only the song called、No other songs are displayed。

This screen is not filtered by genre.、I need to display all 5 songs on this album.、This means you won't be able to listen to all the songs on the album.。

next、After stopping/restarting the music app again、[Album]-[BJ Special Track]If you choose、This time, all 5 songs will be displayed as shown in the screen below.。This is the correct display。

but、Subsequently[Genre]-[Ethnic]If you choose、以下の画面のようにジャンルで絞られないで5曲全部表示されてしまいます

実はこれはiOS7上のWalking Player v1.02でも同じ問題が発生します。(iOS6.1では標準のミュージックアプリもWalking Playerもこの問題は発生しません。)

[Workaround]
とりあえずアプリを再起動したらどちらか先にアクセスした方は正しく表示されます

[Future response plans]
上記の現象をWalking Playerの動作確認で調査したところiOS7のミュージックライブラリアクセスAPIに問題があることまで判っているので別途Appleにバグレポートしておく予定です。just、特別な条件での問題なのですぐには直してくれないかもしれません