Index: trunk/BNC/src/bncwindow.cpp
===================================================================
--- trunk/BNC/src/bncwindow.cpp	(revision 6682)
+++ trunk/BNC/src/bncwindow.cpp	(revision 6683)
@@ -221,4 +221,6 @@
 
   connect(_rnxPathLineEdit, SIGNAL(textChanged(const QString &)), 
+          this, SLOT(slotBncTextChanged()));
+  connect(_rnxV3CheckBox, SIGNAL(stateChanged(int)),
           this, SLOT(slotBncTextChanged()));
 
@@ -2087,9 +2089,26 @@
   if (sender() == 0 || sender() == _rnxPathLineEdit) {
     enable = !_rnxPathLineEdit->text().isEmpty();
+    enableWidget(enable, _rnxIntrComboBox);
     enableWidget(enable, _rnxSamplSpinBox);
     enableWidget(enable, _rnxSkelLineEdit);
     enableWidget(enable, _rnxScrpLineEdit);
     enableWidget(enable, _rnxV3CheckBox);
-    enableWidget(enable, _rnxIntrComboBox);
+    if (!_rnxV3CheckBox->isChecked()) {
+      enableWidget(enable, _rnxV2Priority);
+    }
+    else {
+      enableWidget(false, _rnxV2Priority);
+    }
+  }
+
+  // RINEX Observations, Signal Priority
+  // -----------------------------------
+  if (sender() == 0 || sender() == _rnxV3CheckBox) {
+    if (!_rnxV3CheckBox->isChecked()) {
+      enableWidget(true, _rnxV2Priority);
+    }
+    else {
+      enableWidget(false, _rnxV2Priority);
+    }
   }