diff --git a/scripts/Process.js b/scripts/Process.js
index a494840..da39a5e 100644
--- a/scripts/Process.js
+++ b/scripts/Process.js
@@ -94,6 +94,7 @@ var Process = (function (process) {
       
     };
 
+
     // get and apply any stored properties  
     return new Promise (function (resolve, reject) {
       
@@ -118,6 +119,14 @@ var Process = (function (process) {
         // the finally decided upon initial values
         pc.useInitial = elementer.getInitial();
         
+        // use the defaults for the preview chart dimensions
+        if(!parseInt(elements.controls.previewHeight.value,10)){
+          elements.controls.previewHeight.value = Process.control.chart.defOptions.height;
+        }
+        if(!parseInt(elements.controls.previewWidth.value,10)){
+          elements.controls.previewWidth.value = Process.control.chart.defOptions.width;
+        }
+        
         // map the values 
         process.applyElementer();
         resolve (elementer);