I just installed a Squeezebox and a Roku to LMCE. It went OK and they have access to the content in the system. However it's organization is lacking, all of the content is reported in one album.
First, is your content in the home/public/data/audio directory or a subdirectory or linked directory?
Second, have you looked in the browse-music folder from the SB to see if its there?
You might create a virtual room (music?) and move it there so you can directly access and send music to it.