I read another article about someone with the same or similar problem, but did not seem to offer a solution. It seems a factory restore may not fix the problem.
It seems as if JB renamed the internal and external sd cards and even tho I can see the music using a file explorer, and even play whichever song from there, the Google Play music just tells me "there is no music kept on this device."
Anybody have a solution?
Well I guess Never Mind now... somehow last night it all "magically" started working. I was copying all my files from my ext sd card onto a laptop so in case I had to do a reset. Then right before I put it away, I checked Play Music... and it was all there! Don't know what did it, but everything seems to be working just fine now...
I had this problem and I unistalled/reinstall Google Play Music and it found my music again. No problems since with that.