Urgent cannot edit Mail Poet forms – blank screen

Hi there,

Thanks for updating the thread with the solution you found. If the issue returns, I’d recommend following these troubleshooting steps:

Step 1: Rule out your browser

Open your site’s wp-admin in an incognito/private browser window (with all extensions disabled) and try editing the form again. Ad-blockers and security extensions are the most common cause of blank MailPoet admin pages — they can block the scripts MailPoet needs to load the editor.

If the form editor loads fine in incognito, the issue is a browser extension. You can then disable your extensions one by one in your regular browser to identify which one is causing the problem.

Step 2: Rule out plugin/theme conflicts

If the issue persists in incognito, the next step is to test for a plugin or theme conflict:

1. Go to Tools → Site Health → Troubleshooting in your WordPress dashboard and click “Enable Troubleshooting Mode.”
2. This will temporarily disable all other plugins and switch to a default theme — only for you, not your visitors.
3. Activate only MailPoet and try editing your form.
4. If it works, re-enable your theme first, then your other plugins one at a time, testing after each, to find the conflict.

Here’s MailPoet’s full guide on conflict testing: How to Test for Theme and Plugin Conflicts

Step 3: Clear your caches

Since your welcome popup is also showing blank on the front end for visitors, please make sure to clear all caches — your caching plugin, any CDN cache, and your server/hosting cache. Sometimes an older cached version of the page persists after a plugin update.

Also, please make sure you’re running the latest version of MailPoet (currently 5.23.0). You can check this under Plugins in your dashboard.

I hope this helps!