diff --git a/lib/bennu/iCalendar_components.php b/lib/bennu/iCalendar_components.php
index 92350981dc0..3c2936b1a22 100644
--- a/lib/bennu/iCalendar_components.php
+++ b/lib/bennu/iCalendar_components.php
@@ -237,6 +237,11 @@ class iCalendar_component {
         $components = array(); // Initialise a stack of components
         $this->clear_errors();
         foreach ($lines as $key => $line) {
+            // ignore empty lines
+            if (trim($line) == '') {
+                continue;
+            }
+
             // Divide the line up into label, parameters and data fields.
             if (!preg_match('#^(?P<label>[-[:alnum:]]+)(?P<params>(?:;(?:(?:[-[:alnum:]]+)=(?:[^[:cntrl:]";:,]+|"[^[:cntrl:]"]+")))*):(?P<data>.*)$#', $line, $match)) {
                 $this->parser_error('Invalid line: '.$key.', ignoring');
diff --git a/lib/bennu/iCalendar_parameters.php b/lib/bennu/iCalendar_parameters.php
index 73aa42cfced..6614b39a001 100644
--- a/lib/bennu/iCalendar_parameters.php
+++ b/lib/bennu/iCalendar_parameters.php
@@ -54,9 +54,9 @@ class iCalendar_parameter {
                 return rfc2445_is_valid_value($value, RFC2445_TYPE_CAL_ADDRESS);
             break;
 
-            // These are textual parameters, so the MUST NOT contain double quotes
+            // RFC-2445: can contain quotes.
             case 'CN':
-                return (strpos($value, '"') === false);
+                return true;
             break;
 
             // These have enumerated legal values
diff --git a/lib/bennu/iCalendar_properties.php b/lib/bennu/iCalendar_properties.php
index bb621ce1c05..8a557a49621 100644
--- a/lib/bennu/iCalendar_properties.php
+++ b/lib/bennu/iCalendar_properties.php
@@ -218,6 +218,7 @@ class iCalendar_property_calscale extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_TEXT;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -235,6 +236,7 @@ class iCalendar_property_method extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_TEXT;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -255,6 +257,7 @@ class iCalendar_property_prodid extends iCalendar_property {
     var $val_default = NULL;
 
     function __construct() {
+        parent::__construct();
         $this->val_default = '-//John Papaioannou/NONSGML Bennu '._BENNU_VERSION.'//EN';
 
         $this->valid_parameters = array(
@@ -270,6 +273,7 @@ class iCalendar_property_version extends iCalendar_property {
     var $val_default = '2.0';
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -290,6 +294,7 @@ class iCalendar_property_attach extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_URI;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'FMTTYPE'     => RFC2445_OPTIONAL | RFC2445_ONCE,
             'ENCODING'    => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -336,6 +341,7 @@ class iCalendar_property_categories extends iCalendar_property {
     var $val_multi   = true;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'LANGUAGE'    => RFC2445_OPTIONAL | RFC2445_ONCE,
             RFC2445_XNAME => RFC2445_OPTIONAL
@@ -350,6 +356,7 @@ class iCalendar_property_class extends iCalendar_property {
     var $val_default = 'PUBLIC';
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -367,6 +374,7 @@ class iCalendar_property_comment extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_TEXT;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'ALTREP'      => RFC2445_OPTIONAL | RFC2445_ONCE,
             'LANGUAGE'    => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -381,6 +389,7 @@ class iCalendar_property_description extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_TEXT;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'ALTREP'      => RFC2445_OPTIONAL | RFC2445_ONCE,
             'LANGUAGE'    => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -395,6 +404,7 @@ class iCalendar_property_geo extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_TEXT;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'ALTREP'      => RFC2445_OPTIONAL | RFC2445_ONCE,
             'LANGUAGE'    => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -435,6 +445,7 @@ class iCalendar_property_location extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_TEXT;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'ALTREP'      => RFC2445_OPTIONAL | RFC2445_ONCE,
             'LANGUAGE'    => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -449,6 +460,7 @@ class iCalendar_property_percent_complete extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_INTEGER;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -471,6 +483,7 @@ class iCalendar_property_priority extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_INTEGER;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -494,6 +507,7 @@ class iCalendar_property_resources extends iCalendar_property {
     var $val_multi   = true;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'ALTREP'      => RFC2445_OPTIONAL | RFC2445_ONCE,
             'LANGUAGE'    => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -508,6 +522,7 @@ class iCalendar_property_status extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_TEXT;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -538,6 +553,7 @@ class iCalendar_property_summary extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_TEXT;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'ALTREP'      => RFC2445_OPTIONAL | RFC2445_ONCE,
             'LANGUAGE'    => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -555,6 +571,7 @@ class iCalendar_property_completed extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_DATE_TIME;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -575,6 +592,7 @@ class iCalendar_property_dtend extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_DATE_TIME;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'VALUE'       => RFC2445_OPTIONAL | RFC2445_ONCE,
             'TZID'        => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -617,6 +635,7 @@ class iCalendar_property_due extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_DATE_TIME;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'VALUE'       => RFC2445_OPTIONAL | RFC2445_ONCE,
             'TZID'        => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -659,6 +678,7 @@ class iCalendar_property_dtstart extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_DATE_TIME;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'VALUE'       => RFC2445_OPTIONAL | RFC2445_ONCE,
             'TZID'        => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -702,6 +722,7 @@ class iCalendar_property_duration extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_DURATION;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -724,6 +745,7 @@ class iCalendar_property_freebusy extends iCalendar_property {
     var $val_multi   = true;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'FBTYPE'      => RFC2445_OPTIONAL | RFC2445_ONCE,
             RFC2445_XNAME => RFC2445_OPTIONAL
@@ -758,6 +780,7 @@ class iCalendar_property_transp extends iCalendar_property {
     var $val_default = 'OPAQUE';
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -783,6 +806,7 @@ class iCalendar_property_attendee extends iCalendar_property {
     // TODO: standard has lots of detail here, make triple sure that we eventually conform
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'LANGUAGE'       => RFC2445_OPTIONAL | RFC2445_ONCE,
             'CN'             => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -823,6 +847,7 @@ class iCalendar_property_contact extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_TEXT;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'ALTREP'      => RFC2445_OPTIONAL | RFC2445_ONCE,
             'LANGUAGE'    => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -837,6 +862,7 @@ class iCalendar_property_organizer extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_CAL_ADDRESS;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'CN'          => RFC2445_OPTIONAL | RFC2445_ONCE,
             'DIR'         => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -877,6 +903,7 @@ class iCalendar_property_recurrence_id extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_DATE_TIME;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'RANGE'       => RFC2445_OPTIONAL | RFC2445_ONCE,
             'TZID'        => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -909,6 +936,7 @@ class iCalendar_property_related_to extends iCalendar_property {
     // TODO: the value of this property must reference another component's UID
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'RELTYPE'     => RFC2445_OPTIONAL | RFC2445_ONCE,
             RFC2445_XNAME => RFC2445_OPTIONAL
@@ -922,6 +950,7 @@ class iCalendar_property_url extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_URI;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -934,6 +963,7 @@ class iCalendar_property_uid extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_TEXT;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -955,6 +985,7 @@ class iCalendar_property_exdate extends iCalendar_property {
     var $val_multi   = true;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'TZID'        => RFC2445_OPTIONAL | RFC2445_ONCE,
             'VALUE'       => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -984,6 +1015,7 @@ class iCalendar_property_exrule extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_RECUR;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -997,6 +1029,7 @@ class iCalendar_property_rdate extends iCalendar_property {
     var $val_multi   = true;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'TZID'        => RFC2445_OPTIONAL | RFC2445_ONCE,
             'VALUE'       => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -1026,6 +1059,7 @@ class iCalendar_property_rrule extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_RECUR;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -1039,6 +1073,7 @@ class iCalendar_property_action extends iCalendar_property {
     var $val_type   = RFC2445_TYPE_TEXT;
     
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -1061,6 +1096,7 @@ class iCalendar_property_repeat extends iCalendar_property {
     var $val_type   = RFC2445_TYPE_INTEGER;
     
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -1072,6 +1108,7 @@ class iCalendar_property_trigger extends iCalendar_property {
     var $val_type   = RFC2445_TYPE_TEXT;
     
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'VALUE' => RFC2445_OPTIONAL | RFC2445_ONCE,
             'RELATED' => RFC2445_OPTIONAL | RFC2445_ONCE,
@@ -1100,6 +1137,7 @@ class iCalendar_property_created extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_DATE_TIME;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -1120,6 +1158,7 @@ class iCalendar_property_dtstamp extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_DATE_TIME;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -1140,6 +1179,7 @@ class iCalendar_property_last_modified extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_DATE_TIME;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -1161,6 +1201,7 @@ class iCalendar_property_sequence extends iCalendar_property {
     var $val_default = 0;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -1184,6 +1225,7 @@ class iCalendar_property_x extends iCalendar_property {
     var $val_type    = NULL;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'LANGUAGE'    => RFC2445_OPTIONAL | RFC2445_ONCE,
             RFC2445_XNAME => RFC2445_OPTIONAL
@@ -1214,6 +1256,7 @@ class iCalendar_property_request_status extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_TEXT;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'LANGUAGE'    => RFC2445_OPTIONAL | RFC2445_ONCE,
             RFC2445_XNAME => RFC2445_OPTIONAL
@@ -1339,6 +1382,7 @@ class iCalendar_property_tzid extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_TEXT;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -1359,6 +1403,7 @@ class iCalendar_property_tzname extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_TEXT;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             'LANGUAGE' => RFC2445_OPTIONAL | RFC2445_ONCE,
             RFC2445_XNAME => RFC2445_OPTIONAL
@@ -1380,6 +1425,7 @@ class iCalendar_property_tzoffsetfrom extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_UTC_OFFSET;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -1400,6 +1446,7 @@ class iCalendar_property_tzoffsetto extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_UTC_OFFSET;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );
@@ -1424,6 +1471,7 @@ class iCalendar_property_class extends iCalendar_property {
     var $val_type    = RFC2445_TYPE_TEXT;
 
     function __construct() {
+        parent::__construct();
         $this->valid_parameters = array(
             RFC2445_XNAME => RFC2445_OPTIONAL
         );