Hmm yes, I got the <?php echo bit too, didn't think about it much. I will have to see what is missing from the HTML for this page (first created in 2008 or maybe even 2005) compared to a modern ZC admin page.

I don't have the keepalive timer so have not seen that behavior. I presume something about the way the file is created allows that to become part of the output. Again, the whole file creation section is untouched from the original... but you are using the old version without incident, right? Thanks for digging up these issues before wider release.