If i want to start from scratch, I select “File” → “New Live Set”. This opens a set called “Untitled” but it contains a bunch of material from what i was working on a couple days ago. How do I start a new project from scratch?
Thanks in advance.
youve saved your set as a template… you need delete all the tracks so ur just left with a blank midi and audio tracks then options>preferences>file folders … at the top it says save current set as template …press it and overwrite the file then when you open ableton it should be a blank set !
exactly. egg, you a smart mofo! 
Raymond