After approximately 13 years, my HF solar WordPress widget stopped working, so I need to make some repairs. I learned the new Widget API and re-implemented the widget plugin. I’ve tried it out on my site, and it appears to be working. Overall, I think the new API made the implementation much easier. A new version of the plugin is available on the linked page.
Because the new Widget API seems simpler, I went ahead and re-implemented the QRZ Callsign Search widget too. A new version of the plugin is available from the linked page.