Re: bbPM blank page
The 500.php shown in that log leads me to believe you are getting a 500 error “Internal Server Error”. Unfortunately, this error log does not show what’s causing the 500 error, which is what is causing your blank screen. We need to find out what’s causing the 500 error.
You can add this to the .htaccess file in your forum root to display all errors to the screen, if you cannot find the logs:
ini_set('error_reporting', E_ALL);
If your host prevents that in your .htaccess, you will have to try something different. There is lots of information online about either custom logging for PHP or displaying PHP errors to the screen.