AirPlay not playing some songs on Denon
Just bought a Denon AVR-1912 for it's AirPlay feature and it works smoothly. However, I noticed that some songs just won't play. I checked and it's not DRM and the file formats are all the same, Apple Lossless .m4a files. I thought about duplicates, but that shouldn't be the case since it won't play the same songs off my iPhone (which definetly does not have any duplicates). So, the same song on the iMac iTunes and on my iPhone4 won't play so it's got to be something with the file but I just can't pinpoint why. Anyone else have the same problems?
AirPlay-OTHER, Mac OS X (10.7.1), iPhone, iPad, iPod Touch