There is no list entry for "Music Player" after having selected it from Settings->Interface->SET TASKBAR PREFERENCES.

There is no change to the indicator icon when it is selected/deselected.

Processor Information:
    Vendor:  GenuineIntel
    CPU Family:  0x6
    CPU Model:  0x2a
    CPU Stepping:  0x7
    CPU Type:  0x0
    Speed:  3301 Mhz
    4 logical processors
    4 physical processors
    HyperThreading:  Unsupported
    FCMOV:  Supported
    SSE2:  Supported
    SSE3:  Supported
    SSSE3:  Supported
    SSE4a:  Unsupported
    SSE41:  Supported
    SSE42:  Supported

Network Information:
    Network Speed:  

Operating System Version:
    Ubuntu 14.04.1 LTS (64 bit)
    Kernel Name:  Linux
    Kernel Version:  3.13.0-37-generic
    X Server Vendor:  The X.Org Foundation
    X Server Release:  11501000
    X Window Manager:  KWin
    Steam Runtime Version:  steam-runtime-release_2014-08-20

Video Card:
    Driver:  NVIDIA Corporation GeForce GTX 560 Ti/PCIe/SSE2

    Driver Version:  4.4.0 NVIDIA 343.22
    OpenGL Version: 4.4
    Desktop Color Depth: 24 bits per pixel
    Monitor Refresh Rate: 60 Hz
    VendorID:  0x10de
    DeviceID:  0x1200
    Number of Monitors:  1
    Number of Logical Video Cards:  1
    Primary Display Resolution:  1920 x 1080
    Desktop Resolution: 1920 x 1080
    Primary Display Size: 18.78" x 10.55"  (21.54" diag)
                                            47.7cm x 26.8cm  (54.7cm diag)
    Primary Bus: PCI Express 16x
    Primary VRAM: 1024 MB
    Supported MSAA Modes:  2x 4x 8x 16x 

Sound card:
    Audio device: Realtek ALC892

Memory:
    RAM:  7939 Mb

Miscellaneous:
    UI Language:  English
    LANG:  en_US.UTF-8
    Microphone:  Not set
    Total Hard Disk Space Available:  239242 Mb
    Largest Free Hard Disk Block:  116010 Mb

Installed software:

Recent Failure Reports: