diff --git a/src/SeerArrayVisualizerWidget.cpp b/src/SeerArrayVisualizerWidget.cpp
index 3d4e7c0..78c28b3 100644
--- a/src/SeerArrayVisualizerWidget.cpp
+++ b/src/SeerArrayVisualizerWidget.cpp
@@ -131,8 +131,11 @@ void SeerArrayVisualizerWidget::setVariableAddress (const QString& address) {
             variableAddressLineEdit->setText("not an address");
         }
 
-    }else{
+    }else if (address != "") {
         variableAddressLineEdit->setText("not an address");
+
+    }else{
+        variableAddressLineEdit->setText("");
     }
 
     arrayTableWidget->setAddressOffset(0);
diff --git a/src/SeerArrayVisualizerWidget.ui b/src/SeerArrayVisualizerWidget.ui
index 98a7355..a068066 100644
--- a/src/SeerArrayVisualizerWidget.ui
+++ b/src/SeerArrayVisualizerWidget.ui
@@ -19,10 +19,10 @@
      <item>
       <widget class="QLineEdit" name="variableNameLineEdit">
        <property name="toolTip">
-        <string>Variable name or expression.</string>
+        <string>Variable expression.</string>
        </property>
        <property name="placeholderText">
-        <string>variable name</string>
+        <string>Variable expression</string>
        </property>
        <property name="clearButtonEnabled">
         <bool>true</bool>
@@ -32,13 +32,13 @@
      <item>
       <widget class="QLineEdit" name="variableAddressLineEdit">
        <property name="toolTip">
-        <string>Variable address.</string>
+        <string>Memory address.</string>
        </property>
        <property name="readOnly">
         <bool>true</bool>
        </property>
        <property name="placeholderText">
-        <string>variable address</string>
+        <string>Memory address</string>
        </property>
        <property name="clearButtonEnabled">
         <bool>false</bool>
diff --git a/src/SeerMemoryVisualizerWidget.cpp b/src/SeerMemoryVisualizerWidget.cpp
index 7031a41..4f2a027 100644
--- a/src/SeerMemoryVisualizerWidget.cpp
+++ b/src/SeerMemoryVisualizerWidget.cpp
@@ -23,7 +23,8 @@ SeerMemoryVisualizerWidget::SeerMemoryVisualizerWidget (QWidget* parent) : QWidg
     setWindowIcon(QIcon(":/seer/resources/seer_64x64.png"));
     setWindowTitle("Seer Memory Visualizer");
 
-    memoryLengthLineEdit->setValidator(new QIntValidator(1, 9999999, this));
+  //memoryLengthLineEdit->setValidator(new QIntValidator(1, 9999999, this));
+    memoryLengthLineEdit->setValidator(new QRegExpValidator(QRegExp("\\s*([1-9]\\d*\\s*)+"), this));
     columnCountSpinBox->setValue(memoryHexEditor->bytesPerLine());
 
     if (memoryHexEditor->memoryMode() == SeerHexWidget::HexMemoryMode) {
@@ -90,27 +91,37 @@ QString SeerMemoryVisualizerWidget::variableName () const {
 void SeerMemoryVisualizerWidget::setVariableAddress (const QString& address) {
 
     unsigned long offset = 0;
-    bool ok = false;
+    bool refresh         = false;
 
     if (address.startsWith("0x")) {
 
+        bool ok = false;
+
         offset = address.toULong(&ok, 16);
 
         if (ok == true) {
             variableAddressLineEdit->setText(address);
+            refresh = true;
         }else{
             variableAddressLineEdit->setText("not an address");
             offset = 0;
         }
 
-    }else{
+    }else if (address != "") {
         variableAddressLineEdit->setText("not an address");
         offset = 0;
+
+    }else{
+        variableAddressLineEdit->setText("");
+        offset = 0;
     }
 
-    //qDebug() << address << offset << ok;
-
     memoryHexEditor->setAddressOffset(offset);
+
+    // Show results immediately.
+    if (refresh) {
+        handleRefreshButton();
+    }
 }
 
 QString SeerMemoryVisualizerWidget::variableAddress () const {
@@ -214,7 +225,13 @@ void SeerMemoryVisualizerWidget::handleRefreshButton () {
         return;
     }
 
-    emit evaluateMemoryExpression(_memoryId, variableAddressLineEdit->text(), memoryLengthLineEdit->text().toInt());
+    int nbytes = 256;
+
+    if (memoryLengthLineEdit->text() != "") {
+        nbytes = memoryLengthLineEdit->text().toInt();
+    }
+
+    emit evaluateMemoryExpression(_memoryId, variableAddressLineEdit->text(), nbytes);
 }
 
 void SeerMemoryVisualizerWidget::handleVariableNameLineEdit () {
diff --git a/src/SeerMemoryVisualizerWidget.ui b/src/SeerMemoryVisualizerWidget.ui
index 297cedc..3a6c41b 100644
--- a/src/SeerMemoryVisualizerWidget.ui
+++ b/src/SeerMemoryVisualizerWidget.ui
@@ -22,23 +22,23 @@
         <string>Variable name or expression.</string>
        </property>
        <property name="placeholderText">
-        <string>variable name</string>
+        <string>Variable expression</string>
        </property>
        <property name="clearButtonEnabled">
-        <bool>false</bool>
+        <bool>true</bool>
        </property>
       </widget>
      </item>
      <item>
       <widget class="QLineEdit" name="variableAddressLineEdit">
        <property name="toolTip">
-        <string>Variable address.</string>
+        <string>Memory address.</string>
        </property>
        <property name="readOnly">
         <bool>true</bool>
        </property>
        <property name="placeholderText">
-        <string>variable address</string>
+        <string>Memory address</string>
        </property>
       </widget>
      </item>
@@ -51,10 +51,10 @@
         <string/>
        </property>
        <property name="placeholderText">
-        <string># Bytes</string>
+        <string># Bytes (default 256)</string>
        </property>
        <property name="clearButtonEnabled">
-        <bool>false</bool>
+        <bool>true</bool>
        </property>
       </widget>
      </item>
@@ -125,7 +125,7 @@
        </property>
        <property name="icon">
         <iconset resource="resource.qrc">
-         <normaloff>:/seer/resources/RelaxLightIcons/document-print.svg</normaloff>:/seer/resources/HighContrast/document-print.svg</iconset>
+         <normaloff>:/seer/resources/RelaxLightIcons/document-print.svg</normaloff>:/seer/resources/RelaxLightIcons/document-print.svg</iconset>
        </property>
       </widget>
      </item>
@@ -139,7 +139,7 @@
        </property>
        <property name="icon">
         <iconset resource="resource.qrc">
-         <normaloff>:/seer/resources/RelaxLightIcons/document-save-as.svg</normaloff>:/seer/resources/HighContrast/document-save-as.svg</iconset>
+         <normaloff>:/seer/resources/RelaxLightIcons/document-save-as.svg</normaloff>:/seer/resources/RelaxLightIcons/document-save-as.svg</iconset>
        </property>
       </widget>
      </item>
@@ -153,7 +153,7 @@
        </property>
        <property name="icon">
         <iconset resource="resource.qrc">
-         <normaloff>:/seer/resources/RelaxLightIcons/view-refresh.svg</normaloff>:/seer/resources/HighContrast/view-refresh.svg</iconset>
+         <normaloff>:/seer/resources/RelaxLightIcons/view-refresh.svg</normaloff>:/seer/resources/RelaxLightIcons/view-refresh.svg</iconset>
        </property>
       </widget>
      </item>
diff --git a/tests/helloarray/helloarray.cpp b/tests/helloarray/helloarray.cpp
index 54b06cd..933dd41 100644
--- a/tests/helloarray/helloarray.cpp
+++ b/tests/helloarray/helloarray.cpp
@@ -4,6 +4,17 @@
 #include <math.h>
 #include <iostream>
 
+float* function1() {
+
+    float* float_array = (float*)malloc(256);
+
+    for (int i=0; i<64; i++) {
+        float_array[i] = (float)i * 1.13;
+    }
+
+    return float_array;
+}
+
 int main (void) {
 
     //
@@ -50,6 +61,10 @@ int main (void) {
         currentPhase += phaseIncrement;
     }
 
+    //
+    //
+    //
+    float* x = function1();
 
     //
     //
@@ -60,6 +75,7 @@ int main (void) {
     free(int_array);
     free(float_array);
     free(sine_array);
+    free(x);
 
     return 0;
 }