・S2U2の最新版の音楽プレイヤー使用時の不具合と、2.14の使用を勧めていた者ですが、 ChangeLogとFAQを読んだら、 Q. What is "Don't lock system"? A. Since v2.20, when S2U2 locks the system, the system will behave as it's locked by the system built-in lock. But on some devices, it may lead to some not-welcome behaviour when locked: for eg, the backlight will be dimmed; on some devices, unlock will always go to the home screen. If you want the device behaves as v2.20 or before, turn on "Don't lock system"(S2U2 Settings -> Advanced). But there is a draw back when it's on, some keys or system functions can be activated even it's locked. なんて書いてあるので、上記設定して最新版で音楽プレイヤー起動中のブランクスクリーン から問題なく復帰できることを確認。T-01A(WM6.5)