How can I make Scratch stop asking to save before closing a file, while I make no changes? This happens when I did Preferences > Behavior > radio button off 'Save files when changed'. Thank-you!
This bug is already fixed in trunk (the current developement branch of Scratch). See for more details: https://code.launchpad.net/~vishalrao/scratch/fix-1547327/+merge/317063
The only thing to do for you now is to wait for the new Scratch update to be released.