install won't start. folders not writeable

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OK ... I have problem again with installation on my server. It states folders /config and /files are not writeable by server...
For fact I know they are.

This seems to fix the problem
Change concrete/config/base.php line #102

# Path to the base directory of THIS install
//define('DIR_BASE', dirname($_SERVER['SCRIPT_FILENAME']));
define('DIR_BASE', dirname($_SERVER["ORIG_SCRIPT_FILENAME"]));


After this, question and stop mark are removed and installation can procede with no problem.