[Chameleon] Same old install problem

[Matt Frost]

Please forgive me for posting with this unoriginal problem - I held out 
as long as I could.
I've just installed 1.99 on my laptop (Mac, Panther, Mapserver binary 
install from Serverlogistics.com) and I can't get any of the Chameleon 
demo pages to open. PHP seems to be working fine- I can drop an echo 
into chameleon.php, and it shows up in the browser. Trouble is, that's 
the only thing that shows up, even in the source code.

What's the next likely troubleshooting step?

Thanks,
Matt Frost