Thank you for your reply. To clarify on the problem, these servers are on an internal network, so Akamai is definitely not part of the problem. It's not just that I'm getting a cached page. I am receiving the correct number of bytes that the new file is, but I receive them from the old file. It's as though Apache sees that the file is a certain length and goes to read that length from the file handle it has, but that file handle has been cached. To my knowledge, in the configuration I'm using, there's no way for Apache to perform caching of any kind, though.
Also, I have attempted the same configuration and experiments on non-
AIX systems over the weekend (Linux and OS X), and I did not have any of the described problem.
Thanks again for any assistance anyone can provide.
~Ryan