Several questions

[simoncn]

The screenshot shows that this is working correctly for:

Janachék, Leos
Jenner, Uwe

but not for:

Brahms, Johannes
Bach, Johann Sebastian

I think you will find this is another tagging issue similar to what caused the problem for Franz Schubert.

A simple way to find the incorrect tags is to do the following:

1) Remove the Composer.reverseName setting and restart MinimServer
2) In the Composer index, find Johann Sebastian Bach and Johannes Brahms
3) Selecting these will show you the files that are tagged incorrectly