I am only having this problem locally in Chrome, not in production. It is also not a problem in Safari or Firefox. I am not sure what caused the problem as my only recent change
This ended up working, with a bunch of finagling:
https://github.com/codica2/rails-puma-ssl
I am now using something like this to launch rails on localhost:
rails s -b 'ssl://localhost:3000?key=server.key&cert=server.crt'
In /etc/hosts, I had to change 127.0.0.1 localhost to 127.0.0.1 localhost.ssl
To see localhost, I have to add the "s" so, for example, Active Admin is here: https://localhost:3000/admin