firmware 6.00 music player shows incorrect folder contents

This is using the built in music player having transferred content with Garmin Express and has started since the device got automatically updated to firmware v6.  The folders look fine navigating to the device as a drive.

If I have say, the following content under the Podcasts category:

[Relatively Prime]

[Sawbones]

[The Allusionist]

[The Sporkful]

[The Skeptics Guide]

selecting the first entry in the list will show me the correct list of files in that folder. Going back, scrolling down a couple of times, then selecting say "The Skeptics Guide" will show me content for "The Sporkful", and after that there's an off by one issue entering folders in that the content of the folder above the selected folder is shown.  Sometimes (but not always) folder names render twice in the list.

On an unrelated issue, I no longer appear to be able to navigate to the music controls by holding the music button so there's no volume/back/etc.  I assume this is intentional and the controls have moved to the run screen.  Is this documented somewhere?  All I can find are some very short release notes in this forum which don't reference music at all.