hi Seth, > Thanks for posting that and for putting together a reproducible example. > I can reproduce the error here and am investigating. Unfortunately, I > think you've encountered a "subtlety" of the S4 system. ugh..lucky me! i should buy a lottery ticket this week :) > Inside myPkg, summary does not resolve to a generic function and so the > desired dispatch does not work. I don't yet understand why. i see, just in case it may be informative for you, i was playing with it this afternoon and i removed by mistake the NAMESPACE and DESCRIPTION files and then it suddenly worked :-? > As a *temporary* workaround, see the attached patch. this is great it works like a charm, i was going nuts to find a way to move this function out from the vignette of the package containing the pipeline into the R code of the package. (within a vignette inside myPkg it was working as well..) thanks a lot for your help, i think i would have had to wait till i die and be born again to reincarnate myself into an R-developer to find that patch :) cheers, robert.