Just curious…but can you drag-and-drop (or copy) something OFF the unit onto your computer?
Also can you copy the music into a different folder on the computer and try drag-and-drop from there?
You seem to be already using MSC but…
If you go to Settings/System Settings/USB you have a choice of MSC or MTP or Auto Detect. Put it on MSC, which locks it in as a basic external drive. MTP lets Windows Media Player control it and does all kinds of eccentric things. Auto may switch it to MTP if it sees Windows Media Player on your computer.
