Oh b*****r spoke too soon. Kept taking the ripping medicine but to no avail. Control Mac now shows duplicates on a very few artists with multiple identical albums. No quads yet but twins and triplets are arriving daily. C15 is well. From a "Numpty" customer perspective it might be helpful if M acknowledged the problem and advised a commitment to resolve the issue. What can you tell us Rick.

AV: Thorens TD160B, SME, ShureV15MK2, 500, 598, 861v4, DSP7200.1, DSP3300HC Samsung UE55, SkyHD.
DINING: MS600, AC200, DSP5200SEUG.
STUDY 504, Roon Nucleus + RevB, 808v6, 5200SE, Mac & PC (Touch Screen), Prime+PS Grado GS1000i
HORIZONTAL: M80, MS200, Red Rose Spirit + Sonus Faber Toys, iPad Mini
A capella to Zydeco