If the extension loads but no shape can be imported try these steps:
On Windows PC
1. Disable Clipboard History
Press Start > Settings
Go to System
On the left panel, press Clipboard
On the right panel, press the toggle to Off for Clipboard history
On the right panel, press Clear under Clear clipboard data
Quit & reload Illustrator
2. Whitelisting the clipboard manager app
Go to your current Firewall app and whitelist the program clipboard_x86_64.exe to make sure it can be executed. It should be accessible under this path:
C:\Program Files (x86)\Common Files\Adobe\CEP\extensions\com.fontself.maker.v2\node_modules\clipboardy\fallbacks\windows\clipboard_x86_64.exe
Have a look at these links (or search Google to whitelist on your specific firewall app):
https://pureinfotech.com/allow-apps-firewall-windows-11/
https://www.lifewire.com/access-manage-windows-10-app-permissions-4587294
3. Whitelist the extension
Go to your current Firewall app and whitelist the program CEP or Node.js
4. Reboot the computer
A complete system refresh can clean up Illustrator's memory and improve your experience for extensions.
On Mac or PC
1. Reload Fontself
You can use Reload Extension from the top-right tray icon or by restarting Illustrator (a computer reboot can also help if you've been working for long days):
2. Whitelist the extension
Go to your current Firewall app and whitelist the program CEP or Node.js
3. Reboot the computer
A complete system refresh can clean up Illustrator's memory and improve your experience for extensions.