diff --git a/ClassDigitizer2Gen.cpp b/ClassDigitizer2Gen.cpp
index 0fb1080..2e5bbf2 100644
--- a/ClassDigitizer2Gen.cpp
+++ b/ClassDigitizer2Gen.cpp
@@ -561,7 +561,7 @@ void Digitizer2Gen::SaveDataToFile(){
     CloseOutFile();
     outFileIndex ++;
     sprintf(outFileName, "%s_%03d.sol", outFileNameBase.c_str(), outFileIndex);
-    outFile = fopen(outFileName, "a+b");
+    outFile = fopen(outFileName, "wb"); //overwrite binary
   }
 
   if( evt->dataType == 0){
diff --git a/ClassDigitizer2Gen.h b/ClassDigitizer2Gen.h
index 7fa1f41..d291bb6 100644
--- a/ClassDigitizer2Gen.h
+++ b/ClassDigitizer2Gen.h
@@ -121,7 +121,7 @@ class Digitizer2Gen {
     uint64_t       GetHandle()    const {return handle;}
     
     Event *evt;  // should be evt[MaxNumber], when full or stopACQ, save into file
-    void OpenOutFile(std::string fileName, const char * mode = "w");
+    void OpenOutFile(std::string fileName, const char * mode = "wb"); //overwrite binary
     void CloseOutFile();
     void SaveDataToFile();
     unsigned int GetFileSize() const {return outFileSize;}
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 1c5d113..6e1865d 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -199,7 +199,6 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent){
       bnOpenScope->setEnabled(true);
       chkSaveRun->setEnabled(true);
       if(chkSaveRun->isChecked() ) cbAutoRun->setEnabled(true);
-
       if( digiSetting ) digiSetting->EnableControl();
 
     });
@@ -563,6 +562,10 @@ void MainWindow::AutoRun(){
         bnStartACQ->setEnabled(true);
         bnStopACQ->setEnabled(false);
         bnComment->setEnabled(false);
+        bnOpenScope->setEnabled(true);
+        chkSaveRun->setEnabled(true);
+        cbAutoRun->setEnabled(true);
+        if( digiSetting ) digiSetting->EnableControl();
       }else{
 
         LogMsg("Wait for 10 sec for next Run....");