diff --git a/Software/PC_Application/LibreVNA-GUI/Calibration/LibreCAL/librecaldialog.cpp b/Software/PC_Application/LibreVNA-GUI/Calibration/LibreCAL/librecaldialog.cpp
index 9deae22..b458c5c 100644
--- a/Software/PC_Application/LibreVNA-GUI/Calibration/LibreCAL/librecaldialog.cpp
+++ b/Software/PC_Application/LibreVNA-GUI/Calibration/LibreCAL/librecaldialog.cpp
@@ -237,7 +237,7 @@ void LibreCALDialog::updateCalibrationStartStatus()
     ui->start->setEnabled(canStart);
     if(canStart) {
         ui->lCalibrationStatus->setText("Ready to start");
-        ui->lCalibrationStatus->setStyleSheet("QLabel { color : black; }");
+        ui->lCalibrationStatus->setStyleSheet("");
     }
 }
 
@@ -254,7 +254,7 @@ void LibreCALDialog::updateDeviceStatus()
     }
     if(device->stabilized()) {
         ui->lDeviceStatus->setText("LibreCAL ready for calibration");
-        ui->lDeviceStatus->setStyleSheet("QLabel { color : black; }");
+        ui->lDeviceStatus->setStyleSheet("");
     } else {
         ui->lDeviceStatus->setText("Heating up, please wait with calibration");
         ui->lDeviceStatus->setStyleSheet("QLabel { color : orange; }");
@@ -263,6 +263,7 @@ void LibreCALDialog::updateDeviceStatus()
 
 void LibreCALDialog::determineAutoPorts()
 {
+    disableUI();
     ui->progressCal->setValue(0);
     ui->lCalibrationStatus->setText("Autodetecting port connections...");
     ui->lCalibrationStatus->setStyleSheet("QLabel { color : green; }");
@@ -422,7 +423,7 @@ void LibreCALDialog::startCalibration()
 
     ui->progressCal->setValue(0);
     ui->lCalibrationStatus->setText("Creating calibration kit from coefficients...");
-    ui->lCalibrationStatus->setStyleSheet("QLabel { color : black; }");
+    ui->lCalibrationStatus->setStyleSheet("");
     auto& kit = cal->getKit();
     kit.clearStandards();
     kit.manufacturer = "LibreCAL ("+coeffSet.name+")";