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Updating to ver 7.3.1 caused my Events Calendar to not render, and a PHP fatal error in the server logs. Regressing to ver 7.3.0 fixed the issue. I went through all my plugins to see if it was a conflict with an existing plugin, and the issue only occurred with ver 7.3.1 of Category Colors enabled, with all plugins disabled other than the base Events Calendar plugin.
In part, the error read: PHP Fatal error: Uncaught Error: Object of class WP_Error could not be converted to string in xxxx(path obfuscated)/wp-includes/formatting.php
WP ver 6.5.5, PHP ver 7.4.33.6
Let me know if I can provide any additional information for troubleshooting. This site is a Intranet, so I won’t be able to provide direct access, unfortunately.