When trying to copy a file from MTP drive SD to internal or other way on Win 10, the copy doesn't work. Windows says the device is busy. Works fine on Win7. After this fails, the device is broken, and other actions will also fail in various ways. Reinserting
the cable fixes the issue.
Playing a file directly with the new "music" player doesn't work, however Windows Media Player does.
Moving a file from one directory to another on the same storage media doesn't work.
All appear to stop sending IN pids near the start of the transfer.
Something to note: normal file transfers in File Explorer to and from the device still work.
Tested with BlackBerry 10 Passport, Nokia Lumia 1520, Nokia N9, Samsung Galaxy S5.