diff --git a/airtime_mvc/application/controllers/ShowbuilderController.php b/airtime_mvc/application/controllers/ShowbuilderController.php
index ee36cb629..48bbed8d9 100644
--- a/airtime_mvc/application/controllers/ShowbuilderController.php
+++ b/airtime_mvc/application/controllers/ShowbuilderController.php
@@ -83,20 +83,19 @@ class ShowbuilderController extends Zend_Controller_Action
     public function scheduleAddAction() {
 
         $request = $this->getRequest();
-
         $mediaItems = $request->getParam("mediaIds", null);
         $scheduledIds = $request->getParam("schedIds", null);
 
-        $json = array();
-
         try {
             $scheduler = new Application_Model_Scheduler();
             $scheduler->scheduleAfter($scheduledIds, $mediaItems);
-
-            $json["message"]="success... maybe";
+        }
+        catch (OutDatedScheduleException $e) {
+            $this->view->error = $e->getMessage();
+            Logging::log($e->getMessage());
         }
         catch (Exception $e) {
-            $json["message"]=$e->getMessage();
+            $this->view->error = $e->getMessage();
             Logging::log($e->getMessage());
         }
 
@@ -106,42 +105,38 @@ class ShowbuilderController extends Zend_Controller_Action
     public function scheduleRemoveAction()
     {
         $request = $this->getRequest();
-
         $items = $request->getParam("items", null);
 
-        $json = array();
-
         try {
             $scheduler = new Application_Model_Scheduler();
             $scheduler->removeItems($items);
-
-            $json["message"]="success... maybe";
         }
-        catch (Exception $e) {
-            $json["message"]=$e->getMessage();
+        catch (OutDatedScheduleException $e) {
+            $this->view->error = $e->getMessage();
+            Logging::log($e->getMessage());
+        }
+        catch (Exception $e) {
+            $this->view->error = $e->getMessage();
             Logging::log($e->getMessage());
         }
-
-        $this->view->data = $json;
     }
 
     public function scheduleMoveAction() {
 
         $request = $this->getRequest();
-
         $selectedItem = $request->getParam("selectedItem");
         $afterItem = $request->getParam("afterItem");
 
-        $json = array();
-
         try {
             $scheduler = new Application_Model_Scheduler();
             $scheduler->moveItem($selectedItem, $afterItem);
-
-            $json["message"]="success... maybe";
+        }
+        catch (OutDatedScheduleException $e) {
+            $this->view->error = $e->getMessage();
+            Logging::log($e->getMessage());
         }
         catch (Exception $e) {
-            $json["message"]=$e->getMessage();
+            $this->view->error = $e->getMessage();
             Logging::log($e->getMessage());
         }
 
diff --git a/airtime_mvc/application/models/Schedule.php b/airtime_mvc/application/models/Schedule.php
index be8aedc75..1c2100d35 100644
--- a/airtime_mvc/application/models/Schedule.php
+++ b/airtime_mvc/application/models/Schedule.php
@@ -313,7 +313,7 @@ class Application_Model_Schedule {
         showt.background_color AS show_background_colour, showt.id AS show_id,
 
         si.starts AS si_starts, si.ends AS si_ends, si.time_filled AS si_time_filled,
-        si.record AS si_record, si.rebroadcast AS si_rebroadcast, si.id AS si_id,
+        si.record AS si_record, si.rebroadcast AS si_rebroadcast, si.id AS si_id, si.last_scheduled AS si_last_scheduled,
 
         sched.starts AS sched_starts, sched.ends AS sched_ends, sched.id AS sched_id,
 
diff --git a/airtime_mvc/application/models/Scheduler.php b/airtime_mvc/application/models/Scheduler.php
index bd06b1ff1..851064145 100644
--- a/airtime_mvc/application/models/Scheduler.php
+++ b/airtime_mvc/application/models/Scheduler.php
@@ -297,10 +297,23 @@ class Application_Model_Scheduler {
 
             $scheduledIds = array();
             foreach ($scheduledItems as $item) {
-                $scheduledIds[] = $item["id"];
+                $scheduledIds[$item["id"]] = $item["timestamp"];
+            }
+
+            $removedItems = CcScheduleQuery::create()->findPks(array_keys($scheduledIds));
+
+            //check to make sure all items selected are up to date
+            foreach ($removedItems as $removedItem) {
+                $ts = $scheduledIds[$removedItem->getDbId()];
+                $instance = $removedItem->getCcShowInstances($this->con);
+                $currTs = intval($instance->getDbLastScheduled("U")) ? : 0;
+
+                if ($ts !== $currTs) {
+                    $show = $instance->getCcShow($this->con);
+                    throw new OutDatedScheduleException("The show {$show->getDbName()} is outdated!");
+                }
             }
 
-            $removedItems = CcScheduleQuery::create()->findPks($scheduledIds);
             $removedItems->delete($this->con);
 
             if ($adjustSched === true) {
@@ -338,6 +351,9 @@ class Application_Model_Scheduler {
         Logging::log("removing gaps from show instance #".$showInstance);
 
         $instance = CcShowInstancesQuery::create()->findPK($showInstance, $this->con);
+        $instance->setDbLastScheduled(new DateTime("now", new DateTimeZone("UTC")));
+        $instance->save($this->con);
+
         $itemStartDT = $instance->getDbStarts(null);
 
         $schedule = CcScheduleQuery::create()
@@ -360,4 +376,6 @@ class Application_Model_Scheduler {
             $itemStartDT = $itemEndDT;
         }
     }
-}
\ No newline at end of file
+}
+
+class OutDatedScheduleException extends Exception {}
\ No newline at end of file
diff --git a/airtime_mvc/application/models/ShowBuilder.php b/airtime_mvc/application/models/ShowBuilder.php
index 9feb17647..01dc84636 100644
--- a/airtime_mvc/application/models/ShowBuilder.php
+++ b/airtime_mvc/application/models/ShowBuilder.php
@@ -22,7 +22,8 @@ class Application_Model_ShowBuilder {
         "runtime" => "",
         "title" => "",
         "creator" => "",
-        "album" => ""
+        "album" => "",
+        "timestamp" => null
     );
 
     /*
@@ -100,9 +101,22 @@ class Application_Model_ShowBuilder {
         return $row;
     }
 
+    private function getRowTimestamp($p_item, &$row) {
+
+        if (is_null($p_item["si_last_scheduled"])) {
+            $ts = 0;
+        }
+        else {
+            $dt = new DateTime($p_item["si_last_scheduled"], new DateTimeZone("UTC"));
+            $ts = intval($dt->format("U"));
+        }
+        $row["timestamp"] = $ts;
+    }
+
     private function makeHeaderRow($p_item) {
 
         $row = $this->defaultRowArray;
+        $this->getRowTimestamp($p_item, &$row);
 
         $showStartDT = new DateTime($p_item["si_starts"], new DateTimeZone("UTC"));
         $showStartDT->setTimezone(new DateTimeZone($this->timezone));
@@ -126,6 +140,7 @@ class Application_Model_ShowBuilder {
         $epoch_now = time();
 
         $showStartDT = new DateTime($p_item["si_starts"], new DateTimeZone("UTC"));
+        $this->getRowTimestamp($p_item, &$row);
 
         //can only schedule the show if it hasn't started and you are allowed.
         if ($epoch_now < $showStartDT->format('U') && $this->user->canSchedule($p_item["show_id"]) == true) {
diff --git a/airtime_mvc/application/models/airtime/CcShowInstances.php b/airtime_mvc/application/models/airtime/CcShowInstances.php
index 26d568f09..d1c97f437 100644
--- a/airtime_mvc/application/models/airtime/CcShowInstances.php
+++ b/airtime_mvc/application/models/airtime/CcShowInstances.php
@@ -76,4 +76,35 @@ class CcShowInstances extends BaseCcShowInstances {
             return $dt->format($format);
         }
     }
+
+    /**
+     * Get the [optionally formatted] temporal [last_scheduled] column value.
+     *
+     *
+     * @param      string $format The date/time format string (either date()-style or strftime()-style).
+     *                          If format is NULL, then the raw DateTime object will be returned.
+     * @return     mixed Formatted date/time value as string or DateTime object (if format is NULL), NULL if column is NULL
+     * @throws     PropelException - if unable to parse/validate the date/time value.
+     */
+    public function getDbLastScheduled($format = 'Y-m-d H:i:s')
+    {
+        if ($this->last_scheduled === null) {
+            return null;
+        }
+
+        try {
+            $dt = new DateTime($this->last_scheduled, new DateTimeZone("UTC"));
+        } catch (Exception $x) {
+            throw new PropelException("Internally stored date/time/timestamp value could not be converted to DateTime: " . var_export($this->last_scheduled, true), $x);
+        }
+
+        if ($format === null) {
+            // Because propel.useDateTimeClass is TRUE, we return a DateTime object.
+            return $dt;
+        } elseif (strpos($format, '%') !== false) {
+            return strftime($format, $dt->format('U'));
+        } else {
+            return $dt->format($format);
+        }
+    }
 } // CcShowInstances
diff --git a/airtime_mvc/public/js/airtime/library/events/library_showbuilder.js b/airtime_mvc/public/js/airtime/library/events/library_showbuilder.js
index a2cb407e1..f5f3f0b8e 100644
--- a/airtime_mvc/public/js/airtime/library/events/library_showbuilder.js
+++ b/airtime_mvc/public/js/airtime/library/events/library_showbuilder.js
@@ -31,18 +31,13 @@ var AIRTIME = (function(AIRTIME){
 			fnResetCol,
 			fnAddSelectedItems,
 		
-		fnTest = function() {
-			alert("hi");
-		};
-		
 		fnResetCol = function () {
 			ColReorder.fnReset( oLibTable );
 			return false;
 		};
 		
 		fnAddSelectedItems = function() {
-			var oSchedTable = $("#show_builder_table").dataTable(),
-				oLibTT = TableTools.fnGetInstance('library_display'),
+			var oLibTT = TableTools.fnGetInstance('library_display'),
 				oSchedTT = TableTools.fnGetInstance('show_builder_table'),
 				aData = oLibTT.fnGetSelectedData(),
 				item,
@@ -68,12 +63,10 @@ var AIRTIME = (function(AIRTIME){
 				} 	
 			}
 			
-			$.post("/showbuilder/schedule-add", 
-				{"format": "json", "mediaIds": aMediaIds, "schedIds": aSchedIds}, 
-				function(json){
-					oLibTT.fnSelectNone();
-					oSchedTable.fnDraw();
-				});
+			AIRTIME.showbuilder.fnAdd(aMediaIds, aSchedIds, function(){
+				oLibTT.fnSelectNone();
+			});
+			
 		};
 		//[0] = button text
 		//[1] = id 
diff --git a/airtime_mvc/public/js/airtime/showbuilder/builder.js b/airtime_mvc/public/js/airtime/showbuilder/builder.js
index af718f056..3e98d1af8 100644
--- a/airtime_mvc/public/js/airtime/showbuilder/builder.js
+++ b/airtime_mvc/public/js/airtime/showbuilder/builder.js
@@ -1,3 +1,61 @@
+var AIRTIME = (function(AIRTIME){
+	var mod,
+		oSchedTable;
+	
+	if (AIRTIME.showbuilder === undefined) {
+		AIRTIME.showbuilder = {};
+	}
+	mod = AIRTIME.showbuilder;
+	
+	function checkError(json) {
+		if (json.error !== undefined) {
+			alert(json.error);
+		}
+	}
+	
+	mod.fnAdd = function(aMediaIds, aSchedIds, callback) {
+		
+		$.post("/showbuilder/schedule-add", 
+			{"format": "json", "mediaIds": aMediaIds, "schedIds": aSchedIds}, 
+			function(json){
+				checkError(json);
+				oSchedTable.fnDraw();
+				
+				if ($.isFunction(callback)) {
+					callback();
+				}
+			});
+	};
+	
+	mod.fnMove = function(aSelect, aAfter) {
+		
+		$.post("/showbuilder/schedule-move", 
+			{"format": "json", "selectedItem": aSelect, "afterItem": aAfter},  
+			function(json){
+				checkError(json);
+				oSchedTable.fnDraw();
+			});
+	};
+	
+	mod.fnRemove = function(aItems) {
+		
+		$.post( "/showbuilder/schedule-remove",
+			{"items": aItems, "format": "json"},
+			function(json) {
+				checkError(json);
+				oSchedTable.fnDraw();
+			});
+	};
+	
+	mod.init = function(oTable) {
+		oSchedTable = oTable;
+	};
+	
+	return AIRTIME;
+	
+}(AIRTIME || {}));
+
+
 $(document).ready(function() {
 	var tableDiv = $('#show_builder_table'),
 		oTable,
@@ -201,15 +259,11 @@ $(document).ready(function() {
 		for (item in aData) {
 			temp = aData[item];
 			if (temp !== null && temp.hasOwnProperty('id')) {
-				aItems.push({"id": temp.id, "instance": temp.instance});
+				aItems.push({"id": temp.id, "instance": temp.instance, "timestamp": temp.timestamp});
 			} 	
 		}
 		
-		$.post( "/showbuilder/schedule-remove",
-			{"items": aItems, "format": "json"},
-			function(data) {
-				oTable.fnDraw();
-			});
+		AIRTIME.showbuilder.fnRemove(aItems);
 	};
 	
 	oTable = tableDiv.dataTable( {
@@ -258,7 +312,7 @@ $(document).ready(function() {
 				//don't select separating rows, or shows without privileges.
 				if ($(node).hasClass("sb-header")
 						|| $(node).hasClass("sb-footer")
-						|| $(node).hasClass("sb-not-allowed")){
+						|| $(node).hasClass("sb-not-allowed")) {
 					return false;
 				}
 				return true;
@@ -352,28 +406,20 @@ $(document).ready(function() {
 			var aMediaIds = [],
 			aSchedIds = [];
 			
-			aSchedIds.push({"id": oPrevData.id, "instance": oPrevData.instance});
+			aSchedIds.push({"id": oPrevData.id, "instance": oPrevData.instance, "timestamp": oPrevData.timestamp});
 			aMediaIds.push({"id": oItemData.id, "type": oItemData.ftype});
 
-			$.post("/showbuilder/schedule-add", 
-				{"format": "json", "mediaIds": aMediaIds, "schedIds": aSchedIds}, 
-				function(json){
-					oTable.fnDraw();
-				});
+			AIRTIME.showbuilder.fnAdd(aMediaIds, aSchedIds);
 		};
 		
 		fnMove = function() {
 			var aSelect = [],
 				aAfter = [];
 		
-			aSelect.push({"id": oItemData.id, "instance": oItemData.instance});
-			aAfter.push({"id": oPrevData.id, "instance": oPrevData.instance});
+			aSelect.push({"id": oItemData.id, "instance": oItemData.instance, "timestamp": oItemData.timestamp});
+			aAfter.push({"id": oPrevData.id, "instance": oPrevData.instance, "timestamp": oPrevData.timestamp});
 	
-			$.post("/showbuilder/schedule-move", 
-				{"format": "json", "selectedItem": aSelect, "afterItem": aAfter},  
-				function(json){
-					oTable.fnDraw();
-				});
+			AIRTIME.showbuilder.fnMove(aSelect, aAfter);
 		};
 		
 		fnReceive = function(event, ui) {
@@ -414,4 +460,7 @@ $(document).ready(function() {
 		.append('<div class="ColVis TableTools"><button class="ui-button ui-state-default"><span>Delete</span></button></div>')
 		.click(fnRemoveSelectedItems);
 	
+	//set things like a reference to the table.
+	AIRTIME.showbuilder.init(oTable);
+	
 });