会出现这种情况，对于是实例用户已忘记单击播放。
This happens, for instance, when the user has forgotten to click Play.
右键单击播放列表中的曲目可添加，清除或重命名曲目。
Right - click a playlist of tracks you can add, remove or rename tracks.
单击与 ACFSampleApp（参见 下载）应用程序相关联的播放按钮开始应用程序。
Start the application by clicking on the play button associated with the ACFSampleApp application (see Download).
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