Current preview release does not work with windows server and mysql database.
Everything installs correctly, the database tables are created and all seems to be ok untill you try to login. After typing in your username and password the system loops back to the login screen continuously.
I saw this problem in etomite a while back also.
This problem appears to be a sessions issue. When I included the following code: session_save_path('../'); just before session_start(); in manager\login_preprocessor.php I can now login OK.
There are some session issues in the code though that are causing problems in windows server in general.
I will investigate further.
Thanks Gary... look forward to hearing what you find out.
, MODX Co-Founder
Follow me on Twitter at @rthrash or catch my occasional unofficial thoughts at thrash.me