Hi Danny. Chances are the update to WordPress 5.5 is what broke it. WordPress stopped including the jQuery Migrate script by default, and that exposed the errors in a lot of plugins and themes. It does not affect Gravity Forms (we are fully compatible with WordPress 5.5) but Gravity Forms forms are indirectly affected because when you have JavaScript errors on the page, the Gravity Forms scripts cannot run to reveal the form. That’s why the display:none remains.
Try installing this plugin to include jQuery Migrate again and see if your form shows up: