Well, it turns out that when I created the embedded public certificate in QTH.app that verifies license files, I didn't notice that the expiration date was set to 3/27/2024, and guess what? It expired today. I just released 0.8.10 today that pushes that expiration date out 50 years. If QTH is not loading your license, please download the new version here:
https://www.w8wjb.com/qth/QTH-0.8.10.dmg
My apologies for any inconvenience.
- Wes W8WJB