Multiple Instances of a Snippet on the same page = FAILS IN REVO. ???

require_once 'path/to/MyClassName.class.php';
 
// send the class instance to a modx var if it hasn't been called already
if ( !isset($modx->myClass) )
{
    $modx->myClass= new MyClassName;
}
 
$output = $modx->myClass->myMethodName($parameters);
$output .= $modx->myClass->myOtherMethodName($parameters);
return $output;