diff --git a/controlsActions.pde b/controlsActions.pde
index 7cc2001..27a8848 100644
--- a/controlsActions.pde
+++ b/controlsActions.pde
@@ -333,11 +333,11 @@ void button_mode_loadVectorFile()
 }
 void numberbox_mode_pixelBrightThreshold(float value)
 {
-  pixelExtractBrightThreshold = int(value+0.5);
+  pixelExtractBrightThreshold = (int) value;
 }
 void numberbox_mode_pixelDarkThreshold(float value)
 {
-  pixelExtractDarkThreshold = int(value+0.5);
+  pixelExtractDarkThreshold = (int) value;
 }
 
 void button_mode_pauseQueue()
@@ -524,13 +524,13 @@ void toggle_mode_moveVector(boolean flag)
 void numberbox_mode_changeMachineWidth(float value)
 {
   clearBoxVectors();
-  float steps = getDisplayMachine().inSteps(value);
+  float steps = getDisplayMachine().inSteps((int) value);
   getDisplayMachine().getSize().x = steps;
 }
 void numberbox_mode_changeMachineHeight(float value)
 {
   clearBoxVectors();
-  float steps = getDisplayMachine().inSteps(value);
+  float steps = getDisplayMachine().inSteps((int) value);
   getDisplayMachine().getSize().y = steps;
 }
 void numberbox_mode_changeMMPerRev(float value)
@@ -553,22 +553,22 @@ void numberbox_mode_changeMinVectorLineLength(float value)
 }
 void numberbox_mode_changePageWidth(float value)
 {
-  float steps = getDisplayMachine().inSteps(value);
+  float steps = getDisplayMachine().inSteps((int) value);
   getDisplayMachine().getPage().setWidth(steps);
 }
 void numberbox_mode_changePageHeight(float value)
 {
-  float steps = getDisplayMachine().inSteps(value);
+  float steps = getDisplayMachine().inSteps((int) value);
   getDisplayMachine().getPage().setHeight(steps);
 }
 void numberbox_mode_changePageOffsetX(float value)
 {
-  float steps = getDisplayMachine().inSteps(value);
+  float steps = getDisplayMachine().inSteps((int) value);
   getDisplayMachine().getPage().getTopLeft().x = steps;
 }
 void numberbox_mode_changePageOffsetY(float value)
 {
-  float steps = getDisplayMachine().inSteps(value);
+  float steps = getDisplayMachine().inSteps((int) value);
   getDisplayMachine().getPage().getTopLeft().y = steps;
 }
 void button_mode_changePageOffsetXCentre()
@@ -576,25 +576,25 @@ void button_mode_changePageOffsetXCentre()
   float pageWidth = getDisplayMachine().getPage().getWidth();
   float machineWidth = getDisplayMachine().getSize().x;
   float diff = (machineWidth - pageWidth) / 2.0;
-  getDisplayMachine().getPage().getTopLeft().x = diff;
+  getDisplayMachine().getPage().getTopLeft().x = (int) diff;
   initialiseNumberboxValues(getAllControls());
 }
 
 void numberbox_mode_changeHomePointX(float value)
 {
-  float steps = getDisplayMachine().inSteps(value);
+  float steps = getDisplayMachine().inSteps((int) value);
   getHomePoint().x = steps;
 }
 void numberbox_mode_changeHomePointY(float value)
 {
-  float steps = getDisplayMachine().inSteps(value);
+  float steps = getDisplayMachine().inSteps((int) value);
   getHomePoint().y = steps;
 }
 void button_mode_changeHomePointXCentre()
 {
   float halfWay = getDisplayMachine().getSize().x / 2.0;
-  getHomePoint().x = halfWay;
-  getHomePoint().y = getDisplayMachine().getPage().getTop();
+  getHomePoint().x = (int) halfWay;
+  getHomePoint().y = (int) getDisplayMachine().getPage().getTop();
   initialiseNumberboxValues(getAllControls());
 }
 
diff --git a/controlsActionsWindows.pde b/controlsActionsWindows.pde
index 3bf771d..b59e450 100644
--- a/controlsActionsWindows.pde
+++ b/controlsActionsWindows.pde
@@ -34,7 +34,7 @@
 
 void button_mode_serialPortDialog()
 {
-  ControlWindow serialPortWindow = cp5.addControlWindow("changeSerialPortWindow",100,100,150,150);
+  ControlWindow serialPortWindow = cp5.addControlWindow("changeSerialPortWindow",100,100,150,350);
   serialPortWindow.hideCoordinates();
   
   serialPortWindow.setBackground(getBackgroundColour());
diff --git a/polargraphcontroller.pde b/polargraphcontroller.pde
index 4c0b441..8981fb3 100644
--- a/polargraphcontroller.pde
+++ b/polargraphcontroller.pde
@@ -51,7 +51,7 @@ import java.awt.event.KeyEvent;
 import java.awt.event.*;
 
 int majorVersionNo = 1;
-int minorVersionNo = 61;
+int minorVersionNo = 7;
 int buildNo = 0;
 
 String programTitle = "Polargraph Controller v" + majorVersionNo + "." + minorVersionNo + " build " + buildNo;
@@ -1201,7 +1201,8 @@ float getGridSize()
 }
 void setGridSize(float s)
 {
-  this.gridSize = s;
+  // round it down
+  this.gridSize = s;//(int)s;
 }
 
 void setSampleArea(float v)