Hi, We've been testing 3.14 and found that you can't 'Add' to a ReadOnly array but you can 'Remove' and change a value. Is that correct? Dim sString as String[] = ["1","2","3","4","5","6"] sString.ReadOnly = True sString.Remove(0) sString[0]=0 Print.sString.Join(",") Result = 0,3,4,5,6 Charlie