Not knowing what that playlist was I think I renamed or deleted it, is this a problem ?

If you renamed it then this isn't a problem - it will just never appear on the playlist list on the unit itself.

If you've deleted it then it should get recreated next time emplode connects to your unit. If it doesn't then some things may go awry.

Really it should not be possible to delete it - I'll put this on my todo list.

--
Mike Crowe
I may not be speaking on behalf of empeg above :-)