i have had problems working out IDL before, i would get error msg's but now for some reason it wont even run a program! from the editor window, if i click on RUN UNTITLED1 in the run menu for eg i get the error msg: IDL> Untitled1 % Attempt to call undefined procedure/function: 'UNTITLED1'. % Execution halted at: $MAIN$ i have already compiled the program and saved it under different names. i've ran it in the as a program or a project. it does it with a program that previously was working ok as well as a new program so i dont know???