Hi, 
I believe that BitDefender is blocking me from saving my engineering software working files to my working folders.  Searching through BitDefender I discover references to Safe Files and it seems to me that this could be the culprit.  Further searching via FaQ etc brought me to a BitDefender advice page directing me to click on Protection and then open a Safe Files pane.  I can find a Protection to click on, but have searched and searched and searched but cannot find a Safe Files pane there nor anywhere else. 
Helpful advice will be much appreciated, thanks.