Actually it’s not BLANK PAGE as your named. It’s page with errors but HIDED .
So the only thing you need to do is: Bring up your errors message to understand what’s going on.
In PHP ( Joomla! is based on PHP ) display_errors can enable via
– php.ini : Most basic way
http://php.net/manual/en/errorfunc.configuration.php
– .htaccess
http://stackoverflow.com/questions/6127980/enabling-error-display-in-php-via-htaccess-only
– Apache configuration file
http://stackoverflow.com/questions/176/error-log-per-virtual-host
It’s all about server side ( sysadmin job ).
But we still have one more way.
http://php.net/manual/en/function.ini-set.php
In Joomla! they have configuration and use this init_set to change display_errors
So … now you got it.!
Just enable it than you’ll see Fatal error !