I suddenly had the same problem with my Kindle Voyage today, with the same firmware version (5.12.4, dated February 2020). After restarting several times to no avail, I followed the instructions above (deregistered, restarted, registered using the same Amazon account), and this did fix the problem. I was relieved to discover that my books and notes were not removed from the device, so content-wise I was able to pick up where I left off. The only other information I can add regarding this problem is that it seemed to be related somehow to the Home Screen View option, which I usually keep turned off. When I first noticed the blank home page, the only way I could get anything to display on the home page was to go into Settings - Device Options - Advanced Options - Home & Library, turn Home Screen View on and then restart. When the Voyage finished restarting I would get the home screen with all the suggestions and lists that I normally don't want to see. From this page I could open the last book I had been reading. However, if I scrolled down to the lower part of the home screen, it would then freeze. I could not scroll back to the top and, while the lower part remained visible, it was as good as having a blank page displayed--i.e. it didn't respond at all to any taps. What a weird bug!
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