Go to Settings/System Settings/USB Mode and make sure it is MTP. If that setting got changed, WMPlayer is not finding the Fuze.
If it was already on MTP, you may have a mechanical problem with the cord. You can get replacements on Amazon or from cell-phone accessory sellers. DO NOT GET AN IPOD CORD, WHICH WILL DESTROY THE FUZE. You want the sync cable made for the Sansa Fuze (or E200 series).