White Site at activate the Plugin

[Dernerd]

When the Plugin is new activated the quick-Setup Site stucks on a White site, Debug on, Show no Errors.
I have document out this line:
//add_action( 'admin_init', array( &$this, 'coursepress_plugin_do_activation_redirect' ), 0 );

now the Plugin starts correct, but the Instruction Site where nice to have. Is there a Solution?