hey till you say:
First, you should always enable PHP safemode if possible.
but here: http://www.howtoforge.com/joomla_ispconfig
.. it says:
Step 1 - Create a website:
In ISPConfig, create a website via "New site" in the main menu.
On the tab called "Basis" use www for the hostname and myjoomlawebsite.tld for the domain name. Enable MySQL and PHP scripts for this website but disable PHP Safe Mode.
generally, is wwwrun the best owner to be set before uploading a dynamic site ?