I guess, same issue as here viewtopic.php?f=1&t=88376#p438837

If you are talking about MM4 versions, I haven't noticed anything dramatic.
What was the older version when things got messed up? Can you list/elaborate on some of the recent
changes that are of concern to you.

Did you occasionaly do an Unsynchronized check on your files before the older version you mentioned seemed to go astray?

i hate some of the changes to newer versions not as easy to navigate your library, but an older version messed up a lot of file names has dave mathwes tagged and showing as the doors and so on i have to manually go through 200 gigs of stuff rename sort, it runs so slow...