diff --git a/VStim/SheinIdelsonStims/VS_StaticDriftingGrating.m b/VStim/SheinIdelsonStims/VS_StaticDriftingGrating.m
index cb2c215..5f8a57c 100644
--- a/VStim/SheinIdelsonStims/VS_StaticDriftingGrating.m
+++ b/VStim/SheinIdelsonStims/VS_StaticDriftingGrating.m
@@ -123,18 +123,13 @@
 
             %randomize
 
-            if obj.randomizeAngle
-                randomPermutation=randperm(obj.nTotTrials);
-                obj.angleSequence=obj.angleSequence(:,randomPermutation);
-            end
-            if obj.randomizeTF
-                randomPermutation=randperm(obj.nTotTrials);
-                obj.tfSequence=obj.tfSequence(randomPermutation);
-            end
-            if obj.randomizeSF
-                randomPermutation=randperm(obj.nTotTrials);
-                obj.sfSequence=obj.sfSequence(:,randomPermutation);
-            end
+             %randomize
+             if obj.randomizeTF
+                 obj.order=randperm(obj.nTotTrials);
+                 obj.angleSequence=obj.angleSequence(:,obj.order);
+                 obj.tfSequence=obj.tfSequence(obj.order);
+                 obj.sfSequence=obj.sfSequence(:,obj.order);
+             end
 
             
             % Compute increment of phase shift per redraw:
diff --git a/visualStimGUI.m b/visualStimGUI.m
index 0a762c3..6125053 100644
--- a/visualStimGUI.m
+++ b/visualStimGUI.m
@@ -1,6 +1,6 @@
 function []=visualStimGUI(varargin)
 %% Default params
-simulationMode=false;
+simulationMode=true;
 fprintf('Starting visual stimulation GUI in screen mode (for simulation mode start with visualStimGUI(''simulationMode'',1)\n');
 initialVStim='VS_testStim';
 % PsychImaging('PrepareConfiguration');