diff --git a/sirepo/package_data/static/html/silas-source.html b/sirepo/package_data/static/html/silas-source.html
index b3c49e7216..1b341a6ca4 100644
--- a/sirepo/package_data/static/html/silas-source.html
+++ b/sirepo/package_data/static/html/silas-source.html
@@ -9,7 +9,7 @@
       </div>
     </div>
   </div>
-  <div class="row">
+  <div data-ng-show="! source.oldData" class="row">
     <div class="col-md-6" data-ng-if="source.simState.hasFrames()">
       <div data-report-panel="{{ source.laserPulsePlotType('laserPulseAnimation') }}" data-model-name="laserPulseAnimation"></div>
     </div>
diff --git a/sirepo/package_data/static/js/silas.js b/sirepo/package_data/static/js/silas.js
index 782cfa77dc..bda8833d46 100644
--- a/sirepo/package_data/static/js/silas.js
+++ b/sirepo/package_data/static/js/silas.js
@@ -88,6 +88,7 @@ SIREPO.app.controller('SourceController', function (appState, frameCache, persis
     const self = this;
     self.simScope = $scope;
     self.simAnalysisModel = 'laserPulseAnimation';
+    self.oldData = false;
 
     self.simHandleStatus = (data) => {
         if (! appState.isLoaded()) {
@@ -107,6 +108,8 @@ SIREPO.app.controller('SourceController', function (appState, frameCache, persis
     };
 
     self.simState = persistentSimulation.initSimulationState(self);
+    $scope.$on('laserPulse.changed', () => self.oldData = true);
+    $scope.$on('framesCleared', () => self.oldData = false);
 });
 
 SIREPO.app.controller('BeamlineController', function (appState, beamlineService, $scope) {