My OPPO BDP95 player sends audio over HDMI to NAD receiver. Worked great for SACD, DVDA, HDCD and CD. HDMI is the only output from the OPPO. Yesterday played a Tom Petty HDCD and the audio stuttered. Substituted my backup OPPO BDP103. Same issue!! Played Roxy Music Avalon. Same problem. Thinking licensing issues? Have quite a number of favorite titles on HDCD: Roxy Music, Cars, Doors, King Crimson, Kinks .. and like the sound HDCD brings.