Settings are most likely not the issue. Most likely this is something with the data in the database or the database table parameters. Have you run the upgrade-database-to-utf8mb4.pl script on the course? That might help. The syntax is "upgrade-database-to-utf8mb4.pl -c courseId". Note that will create a webwork.sql backup file of the entire database. If something goes wrong the script will let you know, and you should immediately restore that backup with "mysqldump webwork2 -u webworkWrite -p < webwork.sql".
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