Hi Amanda,
Sorry to hear about the continued trouble with this.
Since the issue was previously resolved by disabling Shield’s HTTP Headers options, it’s possible that something has changed after that—such as a WordPress update or another plugin/theme—that’s causing the issue to return.
Here’s what you can try:
Confirm Header Settings: Re-check if the HTTP Headers settings are still disabled in Shield. If they were re-enabled, disabling them again might fix the issue.
Clear and Disable Cache: Sometimes, caching can cause outdated settings or pages to load. If you’re using a caching plugin or browser, consider clearing cache and temporarily disabling it, force refresh the site (F5) and testing the issue again.
Check for Plugin or Theme Updates: If any other plugins or theme were updated just before the problem reappeared, there could be a compatibility issue affecting the Customizer’s functionality.
Review Console & Network Tab: Checking the browser console and network tab (as previously suggested) might reveal new errors that weren’t there before.
Test on a Different Theme: If the issue is theme-related, switching to a default theme could help determine if the theme itself is conflicting with Shield.
Temporarily Disable Other Plugins: Even though Shield’s HTTP Headers were previously identified as the cause, another factor—such as a recent plugin or theme update—might now be contributing to the issue. I recommend disabling one plugin at a time and testing the Customizer after each deactivation to see if the issue is resolved. You can do the same with themes. This can help pinpoint if any other plugin/theme is causing the conflict.
Let me know how it goes,
Thanks.