Hello Taco, the following example (I need to admit that I'm not sure how to properly cite inproceedings) returns a different result in mkii and mkiv. My citation (the fields I use) is probably a bit wrong, but the results should be the same in my opinion. (Only mkii shows the year, in mkiv there's an extra space; the month is not shown anywhere, pubname is only shown in mkii although it's probably not needed anyway since it's already the title (= booktitle in bibtex?) that takes that role. It's also not really clear to me why I need to use author and not artauthor, but well ...) It may be sensible to have some reference about which fields are sensible for what type of publication also among the ConTeXt manuals.
From some unofficial BibTeX reference (http://www.kfunigraz.ac.at/~binder/texhelp/bibtx-14.html):
Format: @INPROCEEDINGS{citation_key, required_fields [, optional_fields] } Required fields: author, title, booktitle, year Optional fields: editor, pages, organization, publisher, address, month, note, key \usemodule [bib] \setuppublications [alternative=num, criterium=all, sorttype=cite] \startpublication [k=3Ddosimetry, t=inproceedings, a=Kormoll, s=, u=] \arttitle{3D In-vivo Dosimetry for Photon Radiotherapy Based on Pair Production} \title{IEEE Nuclear Science Symposium Medical Imaging Conference Record} \author[]{Thomas}[T.]{}{Kormoll} \author[]{Daniela}[D.]{}{Kunath} \author[]{Wolfgang}[W.]{}{Enghardt} \volume{} \issue{} \city{Orlando, Florida} \pubyear{2009} \pubname{IEEE Nuclear Science Symposium Conference Record} \month{October} \day{25-31} \pages{2969-2975} \doi{} \abstract{} \stoppublication \starttext \cite[3Ddosimetry] \placepublications \stoptext Thanks, Mojca