I have the same problem as Deb (“synchronize” comes up on the c250 player when I try to play something, even though I have synchronized the media in windows media player). I find your manual and videos totally useless. Is there a simple, plain English, straightforward answer to this problem? I am not being disrespectful, just descriptive. I have spent 2 hours trying to work my way through this and find it impossible. I am neither stupid nor slow; I have a phd but find your “solutions” illogical.
This is a new problem. I’ve used the player for a year, dl’ing audio books and listening to them with no problems previously. Now suddenly I am getting this “synchronize” message.