The use of rawurldecode in /lib/pear/DB.php poses problem if the password to access the database contains the character % followed by two digits as it "returns a string in which the sequences with percent (%) signs followed by two hex digits have been replaced with literal characters."
This make a new install of phpScheduleIt impossible and using an installed version, it aborts with the error message "Error connecting to database: DB Error: connect failed?"
phpScheduleIt v1.2.11
Apache/2.2.17 (Unix) mod_ssl/2.2.17 OpenSSL/0.9.8r DAV/2 PHP/5.3.4, mysql 5.0.27, Mac OS X Snow Leopard (10.6.

, MacBook Pro 2006 2.33 GHz, 3 GB