I'm always using stock theme bro, never installed other... Maybe the logcat it's on lack of more details. Anyway, I will keep you updated
Tested on multiple devices. Its erroring on all. It's a CM issue. Need to wait on them to fix it. Two new commits were made related to audio in their source. Not sure if that's the exact case since skipping tracks works on Sony Music with screen offline. But I can't do anything about this at least at the moment. Will need to wait on CM to get the fix.