Hi, thank you for getting back to me.
When I click the submit button, that button becomes disabled and the spinner in the chrome tab starts going but the page never changes. There are no console errors and I’ve even tried setting PHPStorm to break on the first PHP script with XDEBUG but it never gets that far (I’ve verified that xdebug is actually running by setting breakpoints in the main plugin file and visiting admin – it breaks so that works).
So I presume this is a JS error although as I said there are no console errors and I can’t see any requests hanging in the network tab in Chrome dev tools.