Heres my dilema, I'm working with the creator of Amfichat to try and figure out why it doesn't work on a certain server. I have installed this on my test server, among other peoples server's and I have never had troubles with it.
Since you have to pay for the script I wont post it, but you can give me are ideas on why it's not working on this certain server.

I have ruled out:
PHP version incompatiablity
PHP register_globals off/on
PHP safe mode off/on
PHP errors off/on
Chmod on any file not set right

Any ideas? Even those that include the 'its a random act of nature'.

P.S. It's a mix of SWF/PHP mostly PHP though (like 3 swf files).