Index: trunk/BNC/combination/bnccomb.cpp
===================================================================
--- trunk/BNC/combination/bnccomb.cpp	(revision 3276)
+++ trunk/BNC/combination/bnccomb.cpp	(revision 3277)
@@ -350,4 +350,21 @@
   out <<                   "Combination:" << endl 
       << "------------------------------" << endl;
+
+  // Check whether master AC present
+  // -------------------------------
+  if (epochs.first()->acName != _masterAC) {
+    QListIterator<cmbEpoch*> itEpo(epochs);
+    while (itEpo.hasNext()) {
+      cmbEpoch* epo = itEpo.next();
+      bncTime   epoTime = epo->time;
+      out << epo->acName.toAscii().data() << " " 
+          << epoTime.datestr().c_str()    << " " 
+          << epoTime.timestr().c_str() << endl;
+      delete epo;
+    }
+    out << "Missing Master AC" << endl;
+    emit newMessage(_log, false);
+    return;
+  }
 
   // Predict Parameters Values, Add White Noise