Hi Martin,
Great news and thank for the feedback.
'Cleanup' searches for hidden files, empty folders and files beginning with '._' and deletes them. So it did do the job as intended, but the B2 then needs to have its internal music reference database updated so that the 'Cleanup' changes are acted on.
That's where 'Scan Disk' comes in. It does the B2 database update, hence the B2 'knows' about the changes.
'Scan Disk' is very important to the B2, so if you are having problems with artist / album/ track listings, 'Scan Disk' usually sorts things out.
Regards,
Peter.