Ridicule and bad vibes: iTunes "Lock" icon caused DJ to crash in the middle of a Gig!

This suddenly just started. iTunes songs with a LOCK icon, when accessed in DJ cause DJ to CRASH. Everybody stopped dancing and started to “BOOO!” They play fine in iTunes. DJ has worked seamlessly with iTunes for years. Wha’ happen? This is for djay algoriddim 3.1.4 on my MacBook Pro Laptop.