I have also had a working, unpublished channel for more than a year. When I got this load error on a new channel I was working on, I decided to try the json file in my known, good, unpublished channel. Well, it broke the existing channel, and even if I reload the original json file before the test, I now get the loading error crash. Now, two unpublished Roku channels even using previously verified and working json files, are crippled. Maybe they will get it fixed this week.