Dear Wayne, I am trying to open a version 2.2. analysis file with analysis version 2.4 and get the error message: cannot read child - key already in use: ccp.nmr.NmrExpPrototype.NmrExpPrototype:<memops.Implementation.MemopsRootid:555511760>:303 What is wrong here? All my other older version 2.2. projects open well. Many thanks - Jana -- Dr. Jana Sticht Freie Universität Berlin Institut für Chemie und Biochemie AG Freund - Proteinbiochemie Thielallee 63 14195 Berlin ++49-30-83853708 (phone)