[ailurux]

But hopefully, the log can give us clues. Do I need to PM you my email address?

No need, I'll add some logging to the firmware and put the .tra somewhere (it might also help others who are running into indexing issues) and reply here when I'm done.

Something I thought of whilst adding the logging though, just to check, are your tracks in a "Music/" directory at the root of the SD card (ie, the file path should start with "Music/...")? If not, this could also cause some tracks to not be indexed by the database.