Can you send an install just to one machine, and (assuming it fails) zip and attach the server.log?
I spent some time looking at that log. It was logging the installs, it turn out it was not able to initialize the database due to a permissions error. Looking at KB56386, it looks like I had the "Impersonate a client after authentication" attribute set too strictly. I am restarting the server with that attribute loosened - hopefully that will fix the problem.
Thanks for the help,