Thanks, struct, for responding.
The issue isn't duplicates, I'm pretty confident. The issue appears to be that during the conversion process, MC fails to convert some files for an unknown reason. Unfortunately, it does not tell me which files it difficulty with and what the problem was: unreadable file, file name too long, difficulty writing the file, just no clue.
For example, when I use dbpoweramp convert to do the same job, it lists all the file *it* has difficulty with. So you might ask, why not use db poweramp for the job? Good question, and I have reasons, and am happy to explain, but isn't really pertinent to this problem.
Anyone else can help?
Thanks!
Peter