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That's a very tricky and frustrating bug! When you're dealing with an Access-Control-Allow-Origin error, it's a good idea to check your server configuration files, like the .htaccess file. Sometimes the header needs to be explicitly added to allow requests from other origins. It's an easy thing to miss, but it's a very common fix for this type of issue. I hope this helps you get it sorted out!

The suggestions here about checking the core files and module settings are excellent. A simple thing that's often overlooked is the browser cache.

Sometimes the changes you make on the backend don't immediately reflect on the front end because the browser is showing a cached version of the page. It's always worth trying a hard refresh (Ctrl+F5) or clearing your browser's cache to see if that solves the issue. It's a quick fix that can sometimes save a lot of debugging time!