Hi, I currently cannot fomus the attached fomus.dbg file. Sorry David for not really looking into this right now - I think you will know much faster. What I can provide, however, is an overview over the revisions, where it works: :) 114: T 115: T 116: T 117: T 118: T 119: T 120: T 121: NIL - rev summary: key signatures 122: NIL 123: NIL 124: NIL 125: NIL 126: NIL 127: NIL 128: NIL 129: NIL 130: NIL 131: NIL 132: NIL 133: NIL 134: NIL 135: NIL 136: NIL 137: NIL 138: NIL 139: NIL The actual error I get: 139: No applicable method for args: (NIL) to #<STANDARD-GENERIC-FUNCTION FOMUS:EVENT-OFF #x85A959E> If I generally dont care about key-sigs, can I / should I turn it off completely ? Merry Xmas, Kilian