I have lost access to wp-admin after inputting multilingual material to a WP/LearnDash site. (message: “Sorry, you are not allowed to access this page.”) I have tried dozens of tweaks to gain access to the backend but have had no success. An IT guy suggested cleaning the database from illegal/invalid characters that probably are causing this problem. Are there any suggestions for a PHP script that I could run and fix the database? Thank you in advance.