I just checked if version 4 fixes airfoil mac’s dropout problem between AE and apps such as Spotify when using DACmagic. And I'm disappointed that it doesn't. I use a MacBook & Airport Express combo for streaming music from both Spotify and iTunes via Cambridge Audio DacMagic (connected to the airport via Toslink). While this works excellent with iTunes, with Spotify I keep getting small dropouts in uneven intervalls between 5 sec – 1 min, making listening impossible. i know from various fora that many others have the same problem. Have a look at this forum, for instance. http://www.computeraudiophile.com/content/Problem-Airport-Express-DacMagic Thanks for a great update but it would be great to have an idea what to do about the DacMagic dropout problem.