Hi Patrick,
It seems, some conflict with any plugin or theme you are using. Would you try switching to a different theme just to check if that is the reason? If that is not the case, try deactivating the active plugins one-by-one to check if any of those is conflicting.
I have tried two themes that respond the same Woocomerce Storefront and WordPress Twenty Sixteen. With the Widget backend working correctly I have activated/deactivated plugins to discover which plugin is causing the problem and this test points to Super Socializer. When SS is active the widget backend screen is frozen (no response of any kind). Deactivate SS widget backend works properly. Let me know how I can help.
Thanks,
Patrick…
Okay. Can you send admin login details at support[at]heateor[dot]com, so that we can look into it?
This issue has been fixed in version 7.8. Kindly update your plugin.
Great Job! Thank you for a great support team!
Patrick…
You’re welcome, Patrick 🙂