FYI, Dell released a patch to 7.3.0.1 and this issue appears to have been fixed!
I installed v7.3 of OMSA onto a new Windows Server 2012 box.   The install seems to go OK but I'm having an issue being able to log into it with Domain Credentials.   It seems to accept the credentials, but then it just comes right back to the login prompt.  The reason why it seems to accept them is that if I intentially type the credentials incorrectly, it will then say "Login Failed", but if it's correct, it just refreshes the screen and comes back to the login prompt.  This happens if i'm logged in locally on the server or doing it remotely.   I've added the server to my trusted and intranet groups in the browser.  I've turned of the firewall.  I'm not checking the "Active Directory" box (tho i've tried it checked and it doesn't work either).  No errors appear in any logs, unless there is a log inside the OMSA directory I should be looking at.   If i type in a local account, such as \Administrator with it's password, it logs in and works.   I have OMSA installed on all of our other servers and they won't seem to have an issue, but this is our first Server 2012 box, the rest are all 2008 R2.    Any thoughts?
OMSA on Windows Server 2012