hi Kassen, > Fluxus can be crashed outright by accidentally giving list-ref two > indices. (list-ref (list 1 2) 3 4) i cannot reproduce this with plt scheme 4.2.3. i got this error as expected: list-ref: expects 2 arguments, given 3: (1 2) 3 4 i suspect the problem is not fluxus related. try to reproduce the crash in drscheme or mzscheme. best, gabor