First of all Mike you are doing a great job as lead, keep up the good work.

Issue: I just did a full blown upgrade from 3.3.5 all the way to 4.6.2 which previously had been using the AD module of old. When I did the upgrade I treated it like a new install per advice from this article: http://www.deutschnetnuke.de/tabid/186/Default.aspx which worked great. Under that method the web config file starts from a clean one and you bring over only the bare necessity vaules so AUTH was not uncommented during upgrade. Once i upgraded I also followed the new way of uploading the AD provider through the HOST Settings Screen since it wasnt defaultly installed. That installed with no issues, however when I go to ADMIN > AUTHENTICATION it throws an error on under the ACTIVE DIRECTORY section (null reference) do to the fact the "Authentication Type" drop down is completely empty.

Since the source is not yet avaliable is their any guidance on where it is pulling these values from so I can go see if they exist or not.

Thanks in advance.

Found it!!! I fired up my vpc and found I had an old copy of the site that gave me issues on there so I went debugged it. I can't believe I missed this the first time or why all my other upgrades worked without a hitch other than perhaps it's something that's appeared in the DNN 3 versions and was changed later on but never removed. I'll have to look into that later.

Anyways, open up your ModuleSettings table in the database and look for AD_ProviderTypeName. Change the value thats in there (something like DotNetNuke.Security......) and replace the cell with DotNetNuke.Authentication.ActiveDirectory.ADSI.ADSIProvider, DotNetNuke.Authentication.ActiveDirectory. That should do the trick.