James -- thanks for the link. Thankfully, I did the factory reset on my own after I wrote, figuring nothing else would work -- and it did. Of course, this is an inelegant solution and will be a real problem as I add more apps and books to the Vox because, as you know, each factory reset causes a loss of all data.
Now, on to the next annoyance: is there any way to stop that annoying blinking green light at the top of the Vox? It's very distracting when you're reading to see a perpetually blinking light. Can someone please address this? Thanks!