Hello, In coordinates.lisp, the function coordinate-epsilon is first defined to return a value greater than 0, and then redefined to return 0 (and to be inlined). Having that function return 0 causes a lot of problem in my Bezier region code, and it is surely not what was intended. -- Robert Strandh --------------------------------------------------------------------- Greenspun's Tenth Rule of Programming: any sufficiently complicated C or Fortran program contains an ad hoc informally-specified bug-ridden slow implementation of half of Common Lisp. ---------------------------------------------------------------------