Poorly handles https

There are two issues in play that causes the pencil to be broken as reported by other folks.

1) The plugin assumes HTTP for all resources. Changing out https:// for just // makes it fetch resources based on the protocol used to call the admin panel (so mine now fetches with HTTPS).

2) Unfortunately, you’re not out of the woods by editing just the plugin. JotForm assume HTTP calls in the bit of JS code that the plugin fetches. See https://www.jotform.com/answers/494030-Secure-requests-for-JS-code-return-insecure-assets#0

So, even if you patch the plugin, it still won’t work because JotForm are returning insecure content references on a secure channel, and browsers don’t allow that.