diff --git a/plugins/channel/usb/usbdemodgui.cpp b/plugins/channel/usb/usbdemodgui.cpp
index 7d47c760d..3058c9cc6 100644
--- a/plugins/channel/usb/usbdemodgui.cpp
+++ b/plugins/channel/usb/usbdemodgui.cpp
@@ -145,7 +145,7 @@ USBDemodGUI::USBDemodGUI(PluginAPI* pluginAPI, QWidget* parent) :
 	m_channelMarker->setColor(Qt::blue);
 	m_channelMarker->setBandwidth(5000);
 	m_channelMarker->setCenterFrequency(2500);
-	m_channelMarker->setVisible(false);
+	m_channelMarker->setVisible(true);
 	connect(m_channelMarker, SIGNAL(changed()), this, SLOT(viewChanged()));
 	m_pluginAPI->addChannelMarker(m_channelMarker);
 
diff --git a/sdrbase/gui/glspectrum.cpp b/sdrbase/gui/glspectrum.cpp
index ce99a3919..16db20b61 100644
--- a/sdrbase/gui/glspectrum.cpp
+++ b/sdrbase/gui/glspectrum.cpp
@@ -1183,7 +1183,8 @@ void GLSpectrum::mouseMoveEvent(QMouseEvent* event)
 		return;
 	} else if(m_cursorState == CSChannelMoving) {
 		Real freq = m_frequencyScale.getValueFromPos(event->x() - m_leftMarginPixmap.width() - 1) - m_centerFrequency;
-		m_channelMarkerStates[m_cursorChannel]->m_channelMarker->setCenterFrequency(freq);
+		if(m_channelMarkerStates[m_cursorChannel]->m_channelMarker->getColor()!=Qt::blue)
+			m_channelMarkerStates[m_cursorChannel]->m_channelMarker->setCenterFrequency(freq);
 	}
 
 	if(m_displayWaterfall || m_displayHistogram || m_displayMaxHold) {
@@ -1226,7 +1227,8 @@ void GLSpectrum::mousePressEvent(QMouseEvent* event)
 		m_cursorState = CSChannelMoving;
 		m_cursorChannel = 0;
 		Real freq = m_frequencyScale.getValueFromPos(event->x() - m_leftMarginPixmap.width() - 1) - m_centerFrequency;
-		m_channelMarkerStates[m_cursorChannel]->m_channelMarker->setCenterFrequency(freq);
+		if(m_channelMarkerStates[m_cursorChannel]->m_channelMarker->getColor()!=Qt::blue)
+			m_channelMarkerStates[m_cursorChannel]->m_channelMarker->setCenterFrequency(freq);
 		return;
 	}
 }