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After a 126.96.36.199 to 188.8.131.52 upgrade, errors when weI try to insert an Image or a Widget :
Message for Insert Image : “target element not found for content update”.
Message for Insert Image : “el is null”.
We have the same problem with or without TinyMCE.
The problem with this fix is that pushing the “Insert file” button it does not update directly the respective WYSIWYG HTML content area from the main page, but the Image URL field from INSERT/EDIT opened window.