We'll run some more tests later today, I hope, but right now I'm seeing 2 errors a lot:
[Tue Jul 06 15:29:56 2010] [error] [client (local firewall IP address)] PHP Warning: Invalid argument supplied for foreach() in /srv/http/owl_100/lib/header.i
nc on line 184, referer: fred.dyndns.org/owl_100/admin/index.php?...=users&owluser=4
[Tue Jul 06 15:30:09 2010] [error] [client (remote machine IP address)] File does not exist: /srv/http/owl_100/undefined, referer: fred.dyndns.org/owl_100/modify.php?sess=...load¤tdb=0
[added]
It might be a size issue after all, the person uploading the file left a zero off of the size when telling me about it (don't rely on the reports of others when troubleshooting), so it may be too big. There's something wrong with the file to be that big, so I'm going to get that fixed first then see if there is still a problem.