Hi!
Getting WSOD usually means you get some kind of runtime/syntax error in the PHP code but have error reporting turned off.
You can check your php.ini, use the error_reporting()/display_errors()/ini_set() functions or even use .htaccess (see the comments at the bottom of the link below).
A first step could be to check your webserver logs, since PHP errors are usually found in the httpd error log.
For more info check out http://se.php.net/manual/en/errorfunc.configuration.php#ini.error-reporting
/J