This has taken hours to locate the source of the error. Even worse, the worx people do not have a forum any longer. I have posted a bug report on the source code website, but PHPMailer-ML has not been touched in a very long time. I am hopeful that someone other than me might benefit from this information.
What version of the product are you using? On what operating system?
Please provide any additional information below.
This took hours to debug. PLEASE fix in the source for others. In PHP 5.4, session_register has been removed (see http://www.php.net/manual/en/migration54.incompatible.php)
The call is still being made in index.php (2x), acp-ml/index.php (3x), and subscribe.php (2x).
Simply change the calls to be of the syntax:
I would point you to the line numbers, but my version is not the standard, and a quick search of the files will rapidly show the line numbers needing this simple change.