Sorry about the problems. WMP sometimes just does wacky things, unfortunately.
In case it’s the Sansa, do a firmware fix before you reload it.
Put the unit in MSC Mode (Settings/System Settings/USB Mode-MSC)
Download from the Manual Firmware Update link in this thread.
http://forums.sandisk.com/t5/Sansa-Clip-Sansa-Clip/Sansa-Clip-Firmware-Update-01-02-18/td-p/280756
Connect the Clip.
Unzip it and drag the unzipped folder or file onto the SANSA CLIP driveletter.
It will load the firmware when you disconnect. Then reset the USB mode to MTP for Windows Media Player.
