Changed dialog box

src/Core.cc

@@ -119,8 +119,8 @@ Core::Core(int &argc, char* argv[]) : QApplication(argc, argv)
         msgBox.setIcon(QMessageBox::Critical);
         msgBox.setText("Could not connect UDP port. Is an instance of " + qAppName() + "already running?");
         msgBox.setInformativeText("You will not be able to receive data via UDP. Please check that you're running the right executable and then re-start " + qAppName() + ". Do you want to close the application?");
-        msgBox.setStandardButtons(QMessageBox::Yes | QMessageBox::Cancel);
-        msgBox.setDefaultButton(QMessageBox::Cancel);
+        msgBox.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
+        msgBox.setDefaultButton(QMessageBox::No);
         int ret = msgBox.exec();
 
         // Close the message box shortly after the click to prevent accidental clicks