Hi Tom,

Yes they used to but at some point seem to have got corrupted. I can't pinpoint when but they played ok on older Mac operating systems some years ago.

They are all of the mountain gorillas in Rwanda which is why i'd like to keep them.
An Apple media guy on their helpline said it appears to be a content problem which stops them playing properly now.

I have tried various "repair "apps to no avail.

Best
Philip

Marantz NR1710, 5x Martin Logan Fresco i, BW PV1 sub,, Panasonic TX55GZ950, Sky HD+,Panasonic DP-UB820 Blu-Ray.