Music files not shown in iTunes.

Question:

Why are shared music files not shown in iTunes even though the Ciphertex NAS is listed?

Answer:

If you put the wrong m3u file on your Multimedia Folder, it will cause the iTunes Program to stop displaying the shared music from the NAS.
The music files still exist on the NAS, but all the music in the SHARED Library on the iTunes Program will disappear.
The issue seems that the iTunes Program will drop the connection as long as there is one file format that is incorrect.