Cleaning up playlist list in MSC mode

I was fiddling around with a playlist in MSC mode (under LInux).  At this point the disk listing shows one playlist  named Play1 (the result of a renaming).  But the list on the device shows several playlists with different names beginning with Play1, but none with Play1 by itselt.  And all of them are empty.

The information shown on the disk listing is correct.  How can I resynchronize the Clip+ to that listing?