Bluray Files Playback Error

I’ve backed up a number of Bluray using Make MKV and selected ‘Back Up’ I end up with a copy of the disc.

Kodi sees the files but when I attempt to payback any of the files I get the usual choices like Show Blu-ray menu, main title etc but when I select one I get the following message ‘One or more items failed to play. Check the log for more information about this message

I’m sure I used to be able to play back these files on previous version of Kodi: Current version is Kodi 16.1 Git:20160424-c32753 using Win 7 SP1

Any feedback would much appreciated