However, Some Or All Of My Itunes Music Library Does Not Play; I Cannot Sign In To My New Squeezenetwork Account; When I Attach Headphones To Squeezebox Boom, Audio Comes From Only One Channel - Logitech Squeezebox Boom Quick Start Manual

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36 Logitech
I have installed SqueezeCenter to allow playing of
music that's kept on my computer. However, some or
all of my iTunes music library does not play
Apple does not allow streaming of music to which DRM has been applied. Most music
purchased from the iTunes Store (with the exception of tracks designated as
"iTunes Plus") have DRM applied, and cannot be played by Squeezebox Boom or
similar devices. CDs which you have ripped, or music purchased in MP3 format
from non-DRM music services (such as emusic, Rhapsody and Amazon MP3)
are compatible.

I cannot sign in to my new SqueezeNetwork account

In order to complete your SqueezeNetwork registration you need to activate it
through the link sent to you via e-mail. Check your inbox for the activation e-mail.
Also check your Junk Mail or Spam folder, as your mail service may have blocked or
redirected the e-mail thinking it was invalid. If you have still not received it, try logging
into SqueezeNetwork and clicking "Resend Activation Email". If that does not work,
please contact Logitech Technical Support.
When I attach headphones to Squeezebox Boom,
audio comes from only one channel
Squeezebox Boom's headphone output also doubles as a subwoofer output.
The subwoofer output is monaural, so if you're getting only one channel from
your headphones, your Squeezebox Boom is probably configured for a subwoofer.
To check, select Settings > Audio > Line Out from the Home Screen.