I have managed to track the problem to slime-remove-old-overlays which clears overlays only in the current buffer. I know that it is supposed to do that, yet when using load-system, i am geting a lot of duplicate notes in the buffers that contain other files from the same system. Is there a way to hook into the system being compiled and clear the notes for all the files that are recompiled or even all the files that belong to the given system. I could not find an obvious way of accomplishing such a task myself :( Ignas Mikalajūnas