diff --git a/admin/main.php b/admin/main.php
index 86260a2..8f3a7e5 100755
--- a/admin/main.php
+++ b/admin/main.php
@@ -97,8 +97,17 @@ function main() {
 		utils_redirect($url);
 	}
 
+	// register all Smarty modifier functions used by the admin templates
 	$smarty->registerPlugin('modifier', 'action_link', 'admin_filter_action');
 	$smarty->registerPlugin('modifier', 'cmd_link', 'admin_filter_command');
+	$smarty->registerPlugin('modifier', 'date', 'date');
+	$smarty->registerPlugin('modifier', 'entry_idtotime', 'entry_idtotime');
+	$smarty->registerPlugin('modifier', 'in_array', 'in_array');
+	$smarty->registerPlugin('modifier', 'htmlspecialchars', 'htmlspecialchars');
+	$smarty->registerPlugin('modifier', 'plugin_getinfo', 'plugin_getinfo');
+	$smarty->registerPlugin('modifier', 'sprintf', 'sprintf');
+	$smarty->registerPlugin('modifier', 'wp_specialchars', 'wp_specialchars');
+	$smarty->registerPlugin('modifier', 'wptexturize', 'wptexturize');
 }
 
 // smarty tag
diff --git a/fp-includes/fp-smartyplugins/function.list_categories.php b/fp-includes/fp-smartyplugins/function.list_categories.php
index 507c369..741c417 100644
--- a/fp-includes/fp-smartyplugins/function.list_categories.php
+++ b/fp-includes/fp-smartyplugins/function.list_categories.php
@@ -104,6 +104,9 @@ function do_print_categories_list(&$lines, &$indentstack, &$result, $params) {
 		array_push($result, $ild);
 
 		$cat_entry = $params ['selected'];
+		if (!is_array($cat_entry)) {
+			$cat_entry = array();
+		}
 
 		if (isset($params ['type']) && ($params ['type'] == 'form' || $params ['type'] == 'check')) {
 			$string = '<label><input name="' . $catname . 'cats[' . $vid . ']" ';
@@ -138,7 +141,7 @@ function do_print_categories_list(&$lines, &$indentstack, &$result, $params) {
 		} elseif (isset($params ['type']) && $params ['type'] == 'linked') {
 			$after = '</a>';
 			if (isset($params ['count']) && $params ['count']) {
-				$index = & $fpdb->get_index($vid);
+				$index = &$fpdb->get_index($vid);
 				$count = ($index) ? $index->length() : 0;
 				$after = " ($count) " . $after;
 			}
diff --git a/fp-plugins/commentcenter/plugin.commentcenter.php b/fp-plugins/commentcenter/plugin.commentcenter.php
index 45b5e56..9df6c0f 100644
--- a/fp-plugins/commentcenter/plugin.commentcenter.php
+++ b/fp-plugins/commentcenter/plugin.commentcenter.php
@@ -332,6 +332,9 @@ class plugin_commentcenter {
 	 * @return integer: The behavoir
 	 */
 	function behavoirFromPolicies($entry, $cats = array()) {
+		if (!is_array($cats)) {
+			$cats = array();
+		}
 		$date = date_from_id($entry);
 		// check if $date is in expected format
 		if (!array_key_exists('time', $date)) {