I'm having the same problem with my nextar #ma715a-4r, the 4 gig one, except I will open it on my computer and my music folder will not show up, it says the device is almost full but that there is nothing on it. However, when I unplug it and turn it on, the music plays. It's rather frustrating. Trying going to the nextar site and troubleshooting, or find your receipt and return the stupid thing, yeh?
Adrea, adrea_helmshire@yahoo.com, January 2009