@@ -80,8 +80,30 @@ MainWindow::MainWindow(QWidget* parent)
     activateFields(false);
     updateRecentFileActions();
 
-    if (Settings::getValue("General", "autoLoadLastDBFileAtStartup").toBool())
+    auto update_structure = [this] {
+        const auto docks = allTableBrowserDocks();
+        std::vector<sqlb::ObjectIdentifier> old_tables;
+        old_tables.reserve(docks.size());
+        for(const auto &dock: docks) {
+            old_tables.push_back(dock->tableBrowser()->currentlyBrowsedTableName());
+        }
+
+        dbStructureModel->reloadData();
+        // Process all waiting events before we call populateStructure,
+        // giving the Application a chance to attach all Widgets.
+        // See #3706
+        QApplication::processEvents();
+        populateStructure(old_tables);
+    };
+
+    if (Settings::getValue("General", "autoLoadLastDBFileAtStartup").toBool()) {
         recentFileActs[0]->trigger();
+        update_structure();
+    }
+
+    connect(&db, &DBBrowserDB::structureUpdated, this, [update_structure = std::move(update_structure)]() {
+        update_structure();
+    });
 }
 
 MainWindow::~MainWindow()
@@ -134,15 +156,6 @@ void MainWindow::init()
 
     // Set up DB structure tab
     dbStructureModel = new DbStructureModel(db, this);
-    connect(&db, &DBBrowserDB::structureUpdated, this, [this]() {
-        std::vector<sqlb::ObjectIdentifier> old_tables;
-        for(const auto& d : allTableBrowserDocks())
-            old_tables.push_back(d->tableBrowser()->currentlyBrowsedTableName());
-
-        dbStructureModel->reloadData();
-
-        populateStructure(old_tables);
-    });
     ui->dbTreeWidget->setModel(dbStructureModel);
     ui->dbTreeWidget->setColumnWidth(DbStructureModel::ColumnName, 300);
     ui->dbTreeWidget->setColumnHidden(DbStructureModel::ColumnObjectType, true);