Thanks... we'll see!
MrDeb - I noticed in one of your screen shots that you have about a dozen files open in editor windows, and some of them have multiple versions. One thing that might help is to close all those you're not using (File | Close All) and only open RTTTL_example.bas.
Also, in the SF IDE, open the menu 'View | Editor Options... | General' tab and check 'Display full filename path in application title bar' and click 'OK'. That way, the main title bar will show exactly which file you have open and are about to compile.