The first thing I checked was the Apache logs. The files Apache is serving are plain text (no CGI). The Apache error log is empty and the access log shows the requests having been served with a status 200.

I have not read the wires with tcpdump. I might have to if there continues to be problems. I am hoping that retrying when there was an error or the file is corrupt gets around the problem. :(

For what it is worth I have seen the problem from three different OpenBSD machines. Each is located in different corners of the city. They were all downloading from the same server (running Apache on Slackware). I have not seen similar problems with that Apache server when using a graphical browser and it runs several sites (wiki, request tracker, etc).