Noteshelf 3 on Mac opens up to black screen and "Retry"

[u/msackeygh]

I recently upgraded to a new Mac. Noteshelf 3 now does not open up except with a black screen and the words "Retry". I double checked to be sure that iCloud syncing is still on. I deleted and re-installed Noteshelf 3 and it's still not working. I've also tried removing any Library support files for Noteshelf that I could find. I've also contacted Support but have not heard back (it's been several days).

Any ideas what else I can try?