I installed 2.3.9074.18820 today from scratch and found I was unable to log in. On IE7 there is no error on the client and the log file displays an "Audit: SecurityFailure Longon with username XXX from IP XXX" message. On IE8 there is an error in the javascript "object expected" on the line "password = net_md5(password); // this makes it superchallenged!!" which in generated in the codebehind for the login box usercontrol:
https://dasblog.svn.codeplex.com/svn/trunk/source/newtelligence.DasBlog.Web/LoginBox.ascx.cs. Debugging on the client shows net_md5 is undefined.
Notably, I have never had dasBlog installed before so I am wondering if the script that defines net_md5 is not being included/executed for first timers? Setting EncryptLoginPassword false (which omits this script) allows me to log in fine. Also, I can login OK from Live Writer regardless.