diff --git a/src/classes/PRunSingleHisto.cpp b/src/classes/PRunSingleHisto.cpp
index 2881a32d..020c31e6 100644
--- a/src/classes/PRunSingleHisto.cpp
+++ b/src/classes/PRunSingleHisto.cpp
@@ -1555,7 +1555,7 @@ void PRunSingleHisto::EstimateN0()
   if (paramNo > 10000) // i.e. fun or map
     return;
 
-  // still missing: set this value in the parameters
+  // get the parameters
   PMsrParamList *param = fMsrInfo->GetMsrParamList();
   assert(param);
 
@@ -1564,6 +1564,11 @@ void PRunSingleHisto::EstimateN0()
     return;
   }
 
+  // check if N0 is fixed. If this is the case, do NOT estimate N0
+  if (param->at(paramNo-1).fStep == 0.0) // N0 parameter fixed
+    return;
+
+
   // check that 'backgr.fit' in the msr-file run block is indeed a parameter number.
   // in case it is a function, nothing will be done.
   Int_t paramNoBkg = fRunInfo->GetBkgFitParamNo();
diff --git a/src/musredit/PTextEdit.cpp b/src/musredit/PTextEdit.cpp
index 0d4fb735..d22e4294 100644
--- a/src/musredit/PTextEdit.cpp
+++ b/src/musredit/PTextEdit.cpp
@@ -2186,6 +2186,9 @@ void PTextEdit::musrView()
   cmd = str + " \"";
 
   str = *fFilenames.find( currentEditor() );
+  int pos = str.lastIndexOf("/");
+  if (pos != -1)
+    str.remove(0, pos+1);
   QString numStr;
   numStr.setNum(fAdmin->getTimeout());
   cmd += str + "\" --timeout " + numStr;
@@ -2194,6 +2197,10 @@ void PTextEdit::musrView()
   cmd += " &";
 
   int status=system(cmd.toLatin1());
+
+  if (status != 0) {
+    cerr << "**WARNING** musrView: something went wrong ..." << endl;
+  }
 }
 
 //----------------------------------------------------------------------------------------------------
diff --git a/src/musredit_qt5/PTextEdit.cpp b/src/musredit_qt5/PTextEdit.cpp
index 6069529e..a31bc17e 100644
--- a/src/musredit_qt5/PTextEdit.cpp
+++ b/src/musredit_qt5/PTextEdit.cpp
@@ -2184,6 +2184,9 @@ void PTextEdit::musrView()
   cmd = str + " \"";
 
   str = *fFilenames.find( currentEditor() );
+  int pos = str.lastIndexOf("/");
+  if (pos != -1)
+    str.remove(0, pos+1);
   QString numStr;
   numStr.setNum(fAdmin->getTimeout());
   cmd += str + "\" --timeout " + numStr;
@@ -2192,6 +2195,10 @@ void PTextEdit::musrView()
   cmd += " &";
 
   int status=system(cmd.toLatin1());
+
+  if (status != 0) {
+    cerr << "**WARNING** musrView: something went wrong ..." << endl;
+  }
 }
 
 //----------------------------------------------------------------------------------------------------