Well folks... It finally happened to me last night... getting Server Error Occured with html.php.
Did the Tapatalk system test and again everything is green and show no problems with our setup.
Checked the Tapatalk files on our server and there is no html.php, I assume this file is on Tapatalks servers.
But just to rule everything out on our end, I am COMPLETELY REMOVING TAPATALK from our server and will then reinstall everything from the latest Tapatalk installer for Xenforo.
Because of this Tapatalk will be unavailable for a bit as I work.
This is my last attempt at getting Tapatalk working correctly if its still broken after this I will probably remove the feature permanantly.