Well, when you said your computer could see the songs that you had loaded previously via MSC, I assumed your player was still in MSC mode. You may want to switch between MSC and MTP (don’t do Auto Detect) and see what you can see on your Clip.
Now my Sansa Clip works. Operationally I can play the music.
But, I cannot get the computer to see my music.
Before I upgraded the firmware, my songs ( all albums and full concerts) were under the heading of *Albums*.
After the firmware upgrade, the Albums file is no longer available.
So while plugged into the computer I cannot see my music. I cannot selectively remove 1 or 3 albums or shows because they do not show up while connected to the computer.