the installation of 1.10.0rc2 (sorry, no version tag available) failed with
"Your session save path appears to be invalid or is not writable." [...]
commented out lines 409-415 and installation (and login etc.) worked fine.
i guess there is something wrong with the test. it might be related to the ACL
issues discussed at http://www.php.net/is_writable
PHP Version 5.2.2 with safe_mode off.
Server API Apache 2.0 Handler.