I found a bug which I could reproduce:
--> Install the server
--> set the shares only to one share, type = Music
(do not add any other shares than this one with music)
Bug: Nothing is being indexed!!
Workaround: Add another share with Pictures.. --> the indexing will start.. and then deactivate the picture share and everything runs fine.
This bug was found in several releases.. but I am reporting only now..