yeah, i've heard of this error in the past.
a friend one told me that there might be an issue with this in the exe.php file:
Code:$password = mysql_escape_string(crypt($_POST["cms_password"],"$2a$07$doowaadiddydiddydumdiddydoo$"));
I've tried it myself, the basically this is what i did to resolve this issue:
clear all you cookies and your chache from your browser, after you do this, the default login and password should work fine.