Fixed the problem, and I’ll post the solution for the good of those who would follow in my footsteps.
One week, several computers and several calls to tech support, I found that last time I updated the firmware, my memory was corrupted. The fix was to place the device in MSC mode, and format it- not using windows media player. Go to My Computer, select the connected player and select format from the right click menu. Then switch it back to MTP mode and it’s good as new.
I never would have stumbled upon that on my own. I thought format was format, and it didn’t matter where you did it. Thanks tech support.
