PackageMaker PostFlight

Hi there, I'm trying to make a fairly simple package, everythings working well except the postflight script. I know the postflight is running, but the commands do not seem to be having any effect. When I run the postflight script in the terminal it works as expected. Does the installer use a sandbox? The following is the script: #!/usr/bin/php -q I've used perl, bash, etc. all the shells I can think of and the result is the same. Any ideas? Cheers, jp