At least once per session when playing Zone through the browser, the connection security indicator (in Chrome) will switch from a padlock icon to the “Not Secure” warning. Clicking on that warning, you will see a more detailed message that “your connection to this site is not fully secure.”
Researching this issue, I’ve found that this warning can occur even when there is a valid certificate if the site is sending mixed traffic (both https and http) over the same SSL socket to your browser.
What resources are being sent insecurely (via HTTP) while I’m connected?