diff --git a/airtime_mvc/application/common/Billing.php b/airtime_mvc/application/common/Billing.php
index 137451172..2dbfafa9a 100644
--- a/airtime_mvc/application/common/Billing.php
+++ b/airtime_mvc/application/common/Billing.php
@@ -329,4 +329,49 @@ class Billing
         $result = Billing::makeRequest($credentials["url"], $query_string);
     }
 
+    public static function getInvoices()
+    {
+        Billing::ensureClientIdIsValid();
+        $credentials = Billing::getAPICredentials();
+
+        $postfields = array();
+        $postfields["username"] = $credentials["username"];
+        $postfields["password"] = md5($credentials["password"]);
+        $postfields["action"] = "getinvoices";
+        $postfields["responsetype"] = "json";
+        $postfields["userid"] = Application_Model_Preference::GetClientId();
+
+        $query_string = "";
+        foreach ($postfields AS $k=>$v) $query_string .= "$k=".urlencode($v)."&";
+
+        $result = Billing::makeRequest($credentials["url"], $query_string);
+
+        $invoices = array();
+        if ($result["invoices"]) {
+            $invoices = $result["invoices"]["invoice"];
+        }
+        return $invoices;
+    }
+
+    /**
+     *  Checks if the customer has any unpaid invoices and if so, returns
+     *  the ID of one of them. Returns 0 otherwise.
+     */
+    public static function checkForUnpaidInvoice() {
+        $invoices = self::getInvoices();
+        $unpaidInvoice = 0;
+        $unpaidInvoices = 0;
+        foreach ($invoices as $invoice)
+        {
+            if ($invoice['status'] == 'Unpaid') {
+                $unpaidInvoices += 1;
+                $unpaidInvoice = $invoice;
+            }
+        }
+        if ($unpaidInvoices > 0) {
+            return $unpaidInvoice;
+        } else {
+            return 0;
+        }
+    }
 }
diff --git a/airtime_mvc/application/common/UsabilityHints.php b/airtime_mvc/application/common/UsabilityHints.php
index fb52de7b6..04022a1a7 100644
--- a/airtime_mvc/application/common/UsabilityHints.php
+++ b/airtime_mvc/application/common/UsabilityHints.php
@@ -21,6 +21,8 @@ class Application_Common_UsabilityHints
 
         $userIsOnCalendarPage = false;
         $userIsOnAddMediaPage = false;
+        $userIsOnShowbuilderPage = false;
+        $userIsSuperAdmin = Application_Model_User::getCurrentUser()->isSuperAdmin();
 
         // If $userPath is set the request came from AJAX so the user's
         // current location inside Airtime gets passed in to this function.
@@ -36,6 +38,11 @@ class Application_Common_UsabilityHints
             if (strpos(strtolower($userPath), 'schedule') !== false) {
                 $userIsOnCalendarPage = true;
             }
+
+            if (strpos(strtolower($userPath), 'showbuilder') !== false) {
+                $userIsOnShowbuilderPage = true;
+            }
+
         } else {
             // If $userPath is not set the request came from inside Airtime so
             // we can use Zend's Front Controller to get the user's current location.
@@ -48,6 +55,10 @@ class Application_Common_UsabilityHints
             if ($currentController == "plupload") {
                 $userIsOnAddMediaPage = true;
             }
+
+            if ($currentController == 'showbuilder') {
+                $userIsOnShowbuilderPage = true;
+            }
         }
 
         if (self::zeroFilesUploaded()) {
@@ -92,9 +103,15 @@ class Application_Common_UsabilityHints
                     "<a href=\"/schedule\">",
                     "</a>");
             }
-        } else {
-            return "";
+        } else if ($userIsOnShowbuilderPage && $userIsSuperAdmin) {
+            $unpaidInvoice = Billing::checkForUnpaidInvoice();
+            if ($unpaidInvoice != null) {
+                $invoiceUrl = "/billing/invoice?invoiceid=" . $unpaidInvoice['id'];
+                $amount = $unpaidInvoice['currencyprefix'] . $unpaidInvoice['total'];
+                return _pro(sprintf("You have an unpaid invoice for %s due soon. <a href='%s'>Please pay it to keep your station on the air.</a>", $amount, $invoiceUrl));;
+            }
         }
+        return "";
     }
 
     /**
diff --git a/airtime_mvc/application/controllers/BillingController.php b/airtime_mvc/application/controllers/BillingController.php
index 4cfbd4f77..bf508036b 100644
--- a/airtime_mvc/application/controllers/BillingController.php
+++ b/airtime_mvc/application/controllers/BillingController.php
@@ -283,26 +283,7 @@ class BillingController extends Zend_Controller_Action {
         $baseUrl = Application_Common_OsPath::getBaseDir();
         $this->view->headLink()->appendStylesheet($baseUrl.'css/billing.css?'.$CC_CONFIG['airtime_version']);
 
-        Billing::ensureClientIdIsValid();
-        $credentials = Billing::getAPICredentials();
-        
-        $postfields = array();
-        $postfields["username"] = $credentials["username"];
-        $postfields["password"] = md5($credentials["password"]);
-        $postfields["action"] = "getinvoices";
-        $postfields["responsetype"] = "json";
-        $postfields["userid"] = Application_Model_Preference::GetClientId();
-        
-        $query_string = "";
-        foreach ($postfields AS $k=>$v) $query_string .= "$k=".urlencode($v)."&";
-        
-        $result = Billing::makeRequest($credentials["url"], $query_string);
-        
-        if ($result["invoices"]) {
-            $this->view->invoices = $result["invoices"]["invoice"];;
-        } else {
-            $this->view->invoices = array();
-        }
+        $this->view->invoices = Billing::getInvoices();
     }
     
     public function invoiceAction()
@@ -312,6 +293,4 @@ class BillingController extends Zend_Controller_Action {
         $invoice_id = $request->getParam('invoiceid');
         self::viewInvoice($invoice_id);
     }
-
-
 }
diff --git a/airtime_mvc/application/forms/BillingClient.php b/airtime_mvc/application/forms/BillingClient.php
index 098c004a4..60561b114 100644
--- a/airtime_mvc/application/forms/BillingClient.php
+++ b/airtime_mvc/application/forms/BillingClient.php
@@ -188,7 +188,7 @@ class Application_Form_BillingClient extends Zend_Form
         $passwordVerify->addValidator($notEmptyValidator);
         $this->addElement($passwordVerify);
 
-        $this->addElement('hash', 'csrf', array(
+        $this->addElement('hash', 'csrf_client', array(
             'salt' => 'unique'
         ));
 
diff --git a/airtime_mvc/application/forms/BillingUpgradeDowngrade.php b/airtime_mvc/application/forms/BillingUpgradeDowngrade.php
index 5ff4ff4de..858f74ddd 100644
--- a/airtime_mvc/application/forms/BillingUpgradeDowngrade.php
+++ b/airtime_mvc/application/forms/BillingUpgradeDowngrade.php
@@ -3,12 +3,7 @@ class Application_Form_BillingUpgradeDowngrade extends Zend_Form
 {
     public function init()
     {
-        $csrf_namespace = new Zend_Session_Namespace('csrf_namespace');
-        $csrf_element = new Zend_Form_Element_Hidden('csrf');
-        $csrf_element->setValue($csrf_namespace->authtoken)->setRequired('true')->removeDecorator('HtmlTag')->removeDecorator('Label');
-        $this->addElement($csrf_element);
-
-        $this->addElement('hash', 'csrf', array(
+        $this->addElement('hash', 'csrf_upgrade', array( //Needs a unique ID (csrf_upgrade) so it doesn't conflict with other tokens in subforms
             'salt' => 'unique'
         ));
 
diff --git a/airtime_mvc/application/layouts/scripts/layout.phtml b/airtime_mvc/application/layouts/scripts/layout.phtml
index bc9b14951..ec2c64088 100644
--- a/airtime_mvc/application/layouts/scripts/layout.phtml
+++ b/airtime_mvc/application/layouts/scripts/layout.phtml
@@ -99,7 +99,7 @@ j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
         <!--<div style="padding-bottom: 2px;">Disk Usage</div>-->
         <div class="disk_usage_progress_bar"></div>
         <div class="disk_usage_percent_in_use"><?php echo sprintf("%01.1fGB of %01.1fGB", $used/pow(2, 30), $total/pow(2, 30)); ?></div>
-        <div class="disk_usage_used" style="width:<?php echo sprintf("%01.1f%%", $used/$total*100) ?>;"></div>
+        <div class="disk_usage_used" style="width:<?php echo sprintf("%01.1f%%", min(100, $used/$total*100)) ?>;"></div>
 
         <!--<div style="margin-top: 15px; font-size: 12px;">
             <?php //echo sprintf("%01.1fGB of %01.1fGB", $used/pow(2, 30), $total/pow(2, 30)); ?>
diff --git a/airtime_mvc/application/models/Datatables.php b/airtime_mvc/application/models/Datatables.php
index 8002f45f0..b966269ae 100644
--- a/airtime_mvc/application/models/Datatables.php
+++ b/airtime_mvc/application/models/Datatables.php
@@ -12,10 +12,15 @@ class Application_Model_Datatables
             if (strstr($term, '~')) {
                 $info = explode('~', $term);
                 if ($dbname == 'utime' || $dbname == 'mtime' || $dbname == 'lptime') {
-                	
-                    $input1 = ($info[0] != "") ? Application_Common_DateHelper::UserTimezoneStringToUTCString($info[0]) : null;
-                    $input2 = ($info[1] != "") ? Application_Common_DateHelper::UserTimezoneStringToUTCString($info[1]) : null;
-                    
+
+                    try {
+                        $input1 = ($info[0] != "") ? Application_Common_DateHelper::UserTimezoneStringToUTCString($info[0]) : null;
+                        $input2 = ($info[1] != "") ? Application_Common_DateHelper::UserTimezoneStringToUTCString($info[1]) : null;
+                    } catch (Exception $e) {
+                        $input1 = null;
+                        $input2 = null;
+                    }
+
                 } else if($dbname == 'bit_rate' || $dbname == 'sample_rate') {
                     $input1 = isset($info[0])?doubleval($info[0]) * 1000:null;
                     $input2 = isset($info[1])?doubleval($info[1]) * 1000:null;
diff --git a/airtime_mvc/application/models/Scheduler.php b/airtime_mvc/application/models/Scheduler.php
index 51b964589..e5ecd707c 100644
--- a/airtime_mvc/application/models/Scheduler.php
+++ b/airtime_mvc/application/models/Scheduler.php
@@ -955,6 +955,10 @@ class Application_Model_Scheduler
         $this->con->beginTransaction();
 
         try {
+            //Increase the transaction isolation level to prevent two concurrent requests from potentially resulting
+            //in tracks scheduled at the same time.
+            $this->con->exec("SET TRANSACTION ISOLATION LEVEL SERIALIZABLE");
+
             $this->validateMediaItems($mediaItems); //Check for missing files, etc.
             $this->validateRequest($scheduleItems, true);
 
@@ -1005,6 +1009,9 @@ class Application_Model_Scheduler
         //$this->con->useDebug(true);
 
         try {
+            //Increase the transaction isolation level to prevent two concurrent requests from potentially resulting
+            //in tracks scheduled at the same time.
+            $this->con->exec("SET TRANSACTION ISOLATION LEVEL SERIALIZABLE");
 
             $this->validateItemMove($selectedItems, $afterItems[0]);
             $this->validateRequest($selectedItems);
diff --git a/airtime_mvc/application/models/Show.php b/airtime_mvc/application/models/Show.php
index 2653fe848..504a53418 100644
--- a/airtime_mvc/application/models/Show.php
+++ b/airtime_mvc/application/models/Show.php
@@ -850,6 +850,9 @@ SQL;
         $con = Propel::getConnection(CcPrefPeer::DATABASE_NAME);
         try {
             $con->beginTransaction();
+            //It is extremely important that we increase the transaction isolation level, so that if two
+            //requests cause the show schedule to be generated at the same time, one will be rolled back.
+            $con->exec("SET TRANSACTION ISOLATION LEVEL SERIALIZABLE");
 
             //UTC DateTime object
             $showsPopUntil = Application_Model_Preference::GetShowsPopulatedUntil();
@@ -862,7 +865,9 @@ SQL;
             $con->commit();
         } catch (Exception $e) {
             $con->rollBack();
-            throw $e;
+            //throw $e;
+            Logging::warn("Did not create show instances due to transaction error. This is usually safe
+                           and caused by two concurrent transactions. " . $e->getMessage());
         }
 
     }
diff --git a/airtime_mvc/application/views/scripts/billing/invoices.phtml b/airtime_mvc/application/views/scripts/billing/invoices.phtml
index ea4cb3401..7fc3f4e01 100644
--- a/airtime_mvc/application/views/scripts/billing/invoices.phtml
+++ b/airtime_mvc/application/views/scripts/billing/invoices.phtml
@@ -5,7 +5,7 @@ $topTextClass = "";
 if (array_key_exists("planupdated", $_GET))
 {
     $topText = _pro("<b>Thank you!</b> Your plan has been updated and you will be invoiced during your next billing cycle.");
-    $topTextClass = "status-good";
+    $topTextClass = "invoice-status-good";
 }
 else {
     $topText = _pro("Tip: To pay an invoice, click \"View Invoice\" and look for the \"Checkout\" button.");
diff --git a/airtime_mvc/application/views/scripts/billing/upgrade.phtml b/airtime_mvc/application/views/scripts/billing/upgrade.phtml
index 835b50d1f..fc1799140 100644
--- a/airtime_mvc/application/views/scripts/billing/upgrade.phtml
+++ b/airtime_mvc/application/views/scripts/billing/upgrade.phtml
@@ -274,7 +274,7 @@ echo($currentProduct["name"]);
  <form id="<?php echo $form->getId(); ?>" method="<?php echo $form->getMethod() ?>" action="<?php echo
     $form->getAction()?>" enctype="<?php echo $form->getEncType();?>">
 
-     <?php echo $form->csrf ?>
+     <?php echo $form->csrf_upgrade ?>
     
     <div id="plantype">
         <?php echo $form->newproductid ?>
@@ -353,8 +353,9 @@ echo($currentProduct["name"]);
         <div id="vaterror"></div>
     </div>
     <div class="clearfix"></div>
-    
-    <div>
+     <?php echo $billingForm->csrf_client ?>
+
+     <div>
     <div class="billing_checkbox">
             <?=$billingForm->getElement("71")->renderViewHelper(); ?>
         </div>
@@ -379,7 +380,7 @@ echo($currentProduct["name"]);
         <b>Total:</b> <span id="total"></span>
     </div>
     
-    <input type="submit" class="btn right-floated" value="Submit Order" id="atpro_submitorder"></input>
+    <input type="submit" class="btn right-floated" value="Submit Order" id="atpro_submitorder">
     <div class="clearfix"></div>
 </form>
 </div>
\ No newline at end of file
diff --git a/airtime_mvc/application/views/scripts/plupload/index.phtml b/airtime_mvc/application/views/scripts/plupload/index.phtml
index a9e625794..4f1d37a64 100644
--- a/airtime_mvc/application/views/scripts/plupload/index.phtml
+++ b/airtime_mvc/application/views/scripts/plupload/index.phtml
@@ -47,7 +47,7 @@
             <div style="padding-bottom: 2px;">Storage</div>
             <div class="disk_usage_progress_bar"></div>
             <div class="disk_usage_percent_in_use"><?php echo sprintf("%01.1f%% ", $used/$total*100) .  _("in use") ?></div>
-            <div class="disk_usage_used" style="width:<?php echo sprintf("%01.1f%%", $used/$total*100) ?>;"></div>
+            <div class="disk_usage_used" style="width:<?php echo sprintf("%01.1f%%", min(100, $used/$total*100)) ?>;"></div>
 
             <div style="margin-top: 17px; font-size: 12px;"><?php echo sprintf("%01.1fGB of %01.1fGB", $used/pow(2, 30), $total/pow(2, 30)); ?></div>
         </div>
diff --git a/airtime_mvc/public/css/billing.css b/airtime_mvc/public/css/billing.css
index 7a0e53980..d749b324b 100644
--- a/airtime_mvc/public/css/billing.css
+++ b/airtime_mvc/public/css/billing.css
@@ -225,6 +225,14 @@
 	color: #ff0000;
 }
 
+.invoice-status-good {
+	background: #e3ffc9 url(images/stream_status.png) no-repeat 10px 10px;
+	border-color: #54b300;
+	padding: 2px 12px 4px 32px;
+	margin: 2px 1px 10px 0px;
+	color: #330;
+}
+
 /** This form is the separate one on the Billing Account Details page (BillingClient.php) */
 #clientdetails_form {
 	width: 500px;
diff --git a/airtime_mvc/public/css/styles.css b/airtime_mvc/public/css/styles.css
index 8929a33f0..953b99a67 100644
--- a/airtime_mvc/public/css/styles.css
+++ b/airtime_mvc/public/css/styles.css
@@ -288,15 +288,13 @@ select {
     color:#ff5d1a;
 }
 .now-playing-block {
-    /*width:35%;*/
-    flex: 1 auto;
+    flex: 1 0;
     background: url(images/masterpanel_spacer.png) no-repeat 0 0;
     margin-left: 152px;
     padding-left: 14px;
 }
 .show-block {
-    /*width:30%;*/
-    flex: 1 auto;
+    flex: 1 0;
 }
 .text-row {
     height:30px;
@@ -3817,10 +3815,8 @@ hr {
 }
 
 .disk_usage_progress_bar {
-    position: absolute;
-    left: 4px;
-    right: 4px;
-    /* width: 118px; */
+    float: left;
+    width: 100%;
     height: 13px;
     background: #444444;
     background: -moz-linear-gradient(top, #464646 0, #3e3e3e 100%);
@@ -3846,7 +3842,7 @@ hr {
     background: -webkit-gradient(linear, left top, left bottom, color-stop(0, #ff6f01), color-stop(100%, #bc5200));
     height:13px;
     z-index: 2;
-    position:absolute;
+    position: relative;
 }
 
 .dropdown-menu li > a:hover, .dropdown-menu li > a:focus, .dropdown-submenu:hover > a
@@ -3962,4 +3958,4 @@ li .ui-state-hover {
 }
 
 /* jQuery dialog */
-.no-close .ui-dialog-titlebar-close {display: none }
\ No newline at end of file
+.no-close .ui-dialog-titlebar-close {display: none }