So, this nuisance of archiva not showing me certain things I've uploaded has come back again as well.
I thought this was a one time fluke, previously. Since everything else that I upload through the web form appears. I finally just deleted the "hidden" one today, and re-uploaded it. And it is hidden - again! I wonder if it is something with my version number. Could someone try uploading a junk zip file using a version number like this: 2010.07.31-build1-sct-en-vtmvmp-non-human-2-version It also failed to build the md5 sum files, etc, for this file, when the upload completed.