diff --git a/api/app/Http/Controllers/ProgramController.php b/api/app/Http/Controllers/ProgramController.php
index 5842341..00e6377 100644
--- a/api/app/Http/Controllers/ProgramController.php
+++ b/api/app/Http/Controllers/ProgramController.php
@@ -89,7 +89,7 @@ QUERY;
               if($item->startdate) print "-- (Item start is {$item->startdate->format('Y-m-d H:i')}, end is ". ($item->enddate ? $item->enddate->format('Y-m-d H:i') : "never") . ")<br/>\n";
             }
     
-            if($item->startdate && $itemStart <= $item->startdate) {
+            if($item->startdate && $itemStart < $item->startdate) {
               if($DEBUG) print "-- Skipping {$item->name} {$item->suffix} (#$item->scheduleid) at {$itemStart->format('Y-m-d H:i')} because it is before the schedule instance start.<br/>\n";
             } else if($item->enddate && $itemStart >= $item->enddate) {
               if($DEBUG) print "-- Skipping {$item->name} {$item->suffix} (#$item->scheduleid) at {$itemStart->format('Y-m-d H:i')} because it is after the schedule instance end.<br/>\n";
@@ -112,7 +112,7 @@ QUERY;
       if($DEBUG) { 
         print "<h2>Schedule changes</h2><ul>";
         foreach(clone $scheduleChanges as $c) { 
-          print "<li>#{$c[2]->scheduleid}: {$c[1]->format('d-m-Y H:i')}: " . ($c[0] == $START ? 'Start' : 'Einde') . " {$c[2]->name} {$c[2]->suffix}</li>";
+          print "<li>#{$c[2]->scheduleid}: {$c[1]->format('d-m-Y H:i')}: " . ($c[0] == $START ? 'Start' : 'Einde') . " {$c[2]->name} {$c[2]->suffix} (prio {$c[2]->priority})</li>";
         }
         print "</ul><hr/>";
       }
@@ -132,8 +132,12 @@ QUERY;
         $priority = $item[2]->priority;
         if($item[0] == $START) { 
           if($active[$priority] != null) { 
-            print( "<b>Error:</b>" . $item[2]->name . ' starts at ' . $item[1]->format('d-m-Y H:i') . ' but ' . $active[$priority]->name . ' is still active then.' );
-            print "<pre>"; var_dump($active); print "</pre>";
+            print( "<b>Error:</b>" . $item[2]->name . ' starts at ' . $item[1]->format('d-m-Y H:i') . ' (prio ' . $item[2]->id . ') but ' . $active[$priority]->name . ' is still active then.' );
+            if($DEBUG) {
+              foreach($active as $prio => $act) {
+                print "-- " . ($act ? $act->name : "[No program]") . " at prio $prio<br/>\n";
+              }
+            }
           }
     
           // When a program starts, it becomes the active program in its layer
@@ -152,7 +156,11 @@ QUERY;
          } else if($item[0] == $END) {
             if($active[$priority] == null) {
               print( "<b>Error:</b>" . $item[2]->name . ' ends at ' . $item[1]->format('d-m-Y H:i') . ' but no program is active at that priority and timestamp.');
-              print "<pre>"; var_dump($active); print "</pre>";
+              if($DEBUG) {
+                foreach($active as $prio => $act) {
+                  print "-- " . ($act ? $act->name : "[No program]") . " at prio $prio<br/>\n";
+                }
+              }
             } 
   
             // When the program ends, its layer becomes inactive.