I have been using MP3TAG for several years. I suddenly started getting strange results when I do Convert Tag to filename.
I am working with a network drive on Windows 10 that I have accessed as M:
Here is my conversion: %genre%\%artist%\%album%$num(%track%,2) - %title%
I originally had it as : M:\%genre%\%artist%\%album%$num(%track%,2) - %title%
I get the same results either way. For some, but not all albums, I am getting an additional folder "M" inserted. I initially selected my entire collection of nearly 20,000 songs. Most albums stayed rooted of M:\ whereas a portion of them were rooted off M:\M. When I compare songs that are working properly with some that are broken, I do not see any obvious reason for the extra folder. The folder structure underneath M is correct, it just has the additional folder added.
Here is an example of a file that works an one that doesn't in the Preview:
--- The file "M:\M\Folk Rock\Bruce Springsteen & The E Street Band\Live1975-85 (Disc 1)\11 - Raise Your Hand.mp3" already exists.
--- The file "M:\Rock\Bryan Adams\Cuts Like a Knife\01 - The Only One.mp3" already exists.
Update: Perhaps this is a bug with removing special characters from name components. It appears that they all have a '/' somewhere in the concatenation of the values.