EDIT: Was "1708 Sync to drive device fails to delete old playli [#5531]" but this is now found to affect MTP devices too e.g. After auto-sync: http://i.imgur.com/vY8lIIm.png .
If having renamed a playlist I auto-sync to a, MM can fails to delete the old .m3u.
EDIT: This post was originally for 1228.
EDIT: first reported in 1193 http://www.mediamonkey.com/forum/viewto ... =1&t=34965
EDIT: This bug persists in 1256, 1282 and 1708.
EDIT This bugs shows on HD SUBST devices and http://www.mediamonkey.com/forum/viewto ... 30#p393763 USB devices
1 Do SUBST Q: "C:\Folder"
2 Create a new MSC device (by copying the Plugins\ DLL) and set drive letter:

3 In the Device Config Auto-sync Playlists tab, select a play list !new
4 Auto-sync
5 Rename the playlist to !new renamed
6 Auto-sync
7 Inspect Q:\Playlists\
Expected: !new renamed.m3u
Observed: !new renamed.m3u and !new.m3u
EDIT: Actually the failure is more general, affecting any playlist on the device and not on the AS list.
Tracked at: http://www.ventismedia.com/mantis/view.php?id=5531