Post_system hook and ob_flush()

[eluser]mscahill[/eluser]
I changed the hook to a display_override hook, and I am now manually outputting the buffer. It works as expected. The page shows up immediately, but the page shows as still loading while the maintenance functions run. I still don't know why this wouldn't work as a post_system hook, but my problem is solved. Hopefully this will help if someone else runs into this problem.