Do you use the latest RadioBOSS 7.2? If so please check if Track Tool shows an error message.
It should show something. Please click the down arrow near the Normalize button and uncheck the "Do not ask" option, click OK. Then click Normalize button, what happens after it?
So, I did a little testing.
I launched the latest RadioBOSS 7.1.6.2 version,
opened the Mysql library, created a new table, and imported a folder of songs.
Under “Extras” > “Edit,” I set the volume for these songs to -13 dB.
I added these songs from the folder to the playlist in RadioBOSS 7.1.6.2 via drag and drop.
The correct volume is displayed in the playlist.
Now I’ve also added the same files to a playlist in the current beta version via drag and drop...
NO VOLUME LEVELS ARE DISPLAYED
When I do the same thing with the library from the current beta version, it only shows errors.
Also, the levels that were set using the other library from 7.1.6.2 aren't displayed.
Both are using the same MySQL database.
So, from my perspective, there must be a bug somewhere in the library or in the beta version of the normalization tool.