Due to some core code changes and how some settings are written to the database you may run into a situation where autologin does not work for the Active Directory provider. Or when you go into the settings for the provider some settings such as Default Domain are missing. Until such time as I can get an updated provider released later this week (I'm hoping) here is the work around

The Work Around:
In the settings in the Auto-Login textbox enter the following: 127.0.0.1
Update the settings
In the Auto-Login textbox remove the 127.0.0.1 ip address
Update the settings

Auto login should now work (you may have to clear your cache and cookies) and any other provider settings that weren't being returned previously should now show up (you may have to re-enter them).