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Using Sendy 5.0. Chrome 86.0.4240.111
In editor, switch to HTML. Then try to switch back to WYSIWYG editor. It doesn't switch back.
Getting blocked:mixed-content on toggle-wysiwyg.php, initiator jquery-3.5.1.min.js:2,
On a brand new newsletter with nothing added yet.
Your domain has a redirect setup to automatically redirect 'http' traffic to 'https'. Hence, please set the APP_PATH in Sendy's /includes/config.php script to 'https://store.pugski.com/sendy' (https) instead of 'http://store.pugski.com/sendy'.