rsp
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@KTaube @Bungle @chris001
You can set permissions to the Suitecrm folder again and delete folder Diagnostic from cache.
sudo chown -R www-data:www-data .
sudo chmod -R 755 .
sudo chmod -R 775 cache custom modules themes data upload
sudo chmod 775 config_override.php 2>/dev/null
Also, run Quick Repair and Rebuild once and try.
Another solution is as below.
I hope this will work.