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- 247 Posts
Have you checked your server's error log? Not the MODX error log, but the server error log. You'll probably find an indication there.
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- 24,544 Posts
PHP 7.x is much more likely that earlier versions to throw a 500 error when it hits a PHP error that earlier versions would pass.
One common culprit involves not having php-mbstring installed.
https://stackoverflow.com/questions/21699774/internal-server-error-http-error-500-after-installing-phpmyadmin-on-a-certain.
Turning on display errors might give you a clue:
https://stackoverflow.com/questions/5680831/php-does-not-display-error-messages/5680885#5680885