Sometimes, due to a PHP error, a Joomla Extension can stop working and, without displaying an error, lead you to a blank page. This White Page is just an Error Page where the error message has been suppressed by your configuration.
In that case try any or all of the following:
1) Check server error logs (not access logs) if you have access to them. (cPanel or other control panels often allow this)
2) Go to Joomla Administration -> Global configuration and enable Error Reporting to Maximum, you can also turn on debugging
3) Put the following code at the END of the configuration.php file BEFORE the closing ?>
ini_set( 'display_errors', true );
error_reporting( E_ALL );
4) In the beginning of your .htaccess file enter:
php_flag display_errors on
php_value error_reporting 2047
(or php_value error_reporting 22527 for PHP 5.3)
5) Check the source of the white page - there might be still some HTML/Errors in the Page Source (Look in your web browser for the “View Source” option)