Thanks for all the replies. I understand the Spotify issue I think but AirPlay isn't working for any media type.

I will test AirPlay on my receiver and compare the differences

As far as sharing from the laptop mojo this should be pretty easy to setup. If you create a share on the computer (assuming Windows) one the share is available just point the Axiomair to the IP address of you computer and then the share name
Here is a link on how to setup sharing on Windows

http://www.dummies.com/how-to/content/how-to-share-folders-and-documents-on-a-windows-8-.html