The 1.4.5 update that came out yesterday should solve this problem. It relates to checking for the presence of a Bluetooth stylus (which was required for our Jot support), as apparently checking for a Bluetooth connection stops music playback. The check is now optional and should be turned off by default but if you find the problem is still happening with the latest version go to the Settings app and locate ArtRage in the left column, then turn off the Bluetooth stylus check.
Matt
ArtRage UI
Ambient Design.