Index: 0.8.8/lib/rrd.php
===================================================================
--- 0.8.8/lib/rrd.php	(revision 7453)
+++ 0.8.8/lib/rrd.php	(revision 7454)
@@ -2060,7 +2060,7 @@
 		$size = 8;
 	}
 
-	return "--font " . strtoupper($type) . ":" . $size . ":" . $font . RRD_NL;
+	return "--font " . strtoupper($type) . ":" . floatval($size) . ":" . $font . RRD_NL;
 }
 
 function rrd_substitute_host_query_data($txt_graph_item, $graph, $graph_item) {
Index: 0.8.8/graph_settings.php
===================================================================
--- 0.8.8/graph_settings.php	(revision 7453)
+++ 0.8.8/graph_settings.php	(revision 7454)
@@ -54,6 +54,10 @@
 
 	while (list($tab_short_name, $tab_fields) = each($settings_graphs)) {
 		while (list($field_name, $field_array) = each($tab_fields)) {
+			/* Check every field with a numeric default value and reset it to default if the inputted value is not numeric  */
+			if (isset($field_array["default"]) && is_numeric($field_array["default"]) && !is_numeric(get_request_var_post($field_name))) {
+				$_POST[$field_name] = $field_array["default"];
+			}
 			if ($field_array["method"] == "checkbox") {
 				if (isset($_POST[$field_name])) {
 					db_execute("REPLACE INTO settings_graphs (user_id,name,value) VALUES (" . $_SESSION["sess_user_id"] . ",'$field_name', 'on')");