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The database table name case issue does sound like an issue, as most MySQL installs (in my experience) are case sensitive.
Other than that, 500 Internal Server Error is most often caused by a misconfiguration of the server, but some servers report 500 instead of a PHP error. Can you check your PHP logs to see if there are any hints there? In addition, can you set up a phpinfo page, and see if that works? That can help distinguish between general server issues, and Gibbon-specific issues.