diff --git a/process.php b/process.php
--- a/process.php
+++ b/process.php
@@ -62,13 +62,17 @@ if (isset($_GET['debug']))
 
 if(!$DEBUG)
   {
-    if(isset($_GET['s']))
+    $s = FALSE;
+    if (isset($_GET['s']))
+      $s = $_GET['s'];
+
+    if($s !== FALSE)
       {
-	$savedSched = schedule_store_retrieve($schedule_store, $_GET['s']);
+	$savedSched = schedule_store_retrieve($schedule_store, $s);
 	if ($savedSched)
 	  $savedSched->writeoutTables();
 	else
-	  Page::show_404('Unable to find a saved schedule with an ID of ' . $_GET['s'] . '.');
+	  page::show_404('Unable to find a saved schedule with an ID of ' . $s . '.');
       }
     elseif(isset($_GET['del']))
       {
@@ -83,8 +87,18 @@ if(!$DEBUG)
 	header('Location: input.php');
 	exit;
       }
+    elseif (!isset($_POST['postData']))
+      {
+	header('Location: input.php');
+	exit;
+      }
     else
       {
+	/*
+	 * we probably have input from the user and should interpret
+	 * it as a schedule to permutate. Then we should redirect the
+	 * user to the canonical URL for that schedule.
+	 */
 		$allClasses = new Schedule($_POST['postData']['name']);
 	
 		foreach($_POST['postData'] as $class)
@@ -114,6 +128,11 @@ if(!$DEBUG)
 		if ($schedule_id != NULL)
 		  $_SESSION['saved'][$schedule_id] = $allClasses->getName();
 
+		$process_php_s = '';
+		if (!$clean_urls)
+		  $process_php_s = 'process.php?s=';
+		header('Location: ' . $process_php_s . $schedule_id);
+		exit;
 		/*
 		 * writeoutTables() needs to know $schedule_id, so it
 		 * has to be called after we save the schedule. See