diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -218,7 +218,9 @@
         m_lateral.get<Viewer3D>("3d")->drawModel(fileName.toString());
 
         const int tabs = m_instances->count();
-        m_openFiles.append(fileName);
+        if(!m_openFiles.contains(fileName)) {
+            m_openFiles.append(fileName);
+        }
 
         for(int i=0; i < tabs; ++i){
             auto instance = qobject_cast<AtCoreInstanceWidget*>(m_instances->widget(i));
@@ -236,4 +238,4 @@
 {
     return palette().text().color().value() >= QColor(Qt::lightGray).value() ? \
         QString("dark") : QString("light");
-}
\ No newline at end of file
+}
diff --git a/src/widgets/gcodeeditorwidget.cpp b/src/widgets/gcodeeditorwidget.cpp
--- a/src/widgets/gcodeeditorwidget.cpp
+++ b/src/widgets/gcodeeditorwidget.cpp
@@ -43,6 +43,15 @@
 }
 void GCodeEditorWidget::loadFile(const QUrl &file)
 {
+    //if the file is loaded then reload the document.
+    for (int i = 0 ; i < m_editor->documents().count(); i++)
+    {
+        if (m_editor->documents().at(i)->url() == file) {
+                m_editor->documents().at(i)->documentReload();
+                return;
+        }
+    }
+
     auto doc = m_editor->documents().first();
     if(!doc->isEmpty()){
         doc = newDoc();