Security sandbox?

I am a novice Flash Programmer and just trying to learn more about this (incredibly) complicated program. Right now I am baffled since my swfs aren’t working as they should. I am starting to fear I’ve been blocked by the infamous Flash security firewall.

I am running a swf file locally through a browser in a regular PC with WAMP server installed. My script should be sending variable data back and forth to php but nothing happens. I am able to execute PHP through swf but that’s it. No data goes anywhere. Uploading the same stuff to a regular web host and accessing it via www worked fine.

Have I been blocked by flash security settings? Is the configuration a problem? If I access the WAMP/WWW server from the network does it work then?

Getting desperate. Don’t want to code HTML although I can make it work easily that way.