As you are using YARRS, could I ask if you have the same problem I do? How big is your Master Playlist File (htdocs/content/100)? I have found that if it's larger than 18872 bytes the Receiver gives an error.

I'm hoping to find someone slse who can test this to confirm it's not my setup. I don't think it's YARRS either, but YARRS is the easiest way to reproduce the problem.