Sorry guys, it looks like I may have broken it already. :oops:

I did an upgrade from 9.0.5 to 9.0.8.
- I deleted all of my original files from 9.0.5 files
- Ran the installation and let the b2evo update my _config file
- Upgraded my database to the new version
- Verified I could login
- Enabled "New User Registration" and logged out.
When I attemped to login again I received the following error:

The page cannot be displayed
The page you are looking for cannot be displayed because an invalid method (HTTP verb) was used to attempt access.
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Please try the following:

Contact the Web site administrator if you believe that this request should be allowed.
Make sure that the Web site address displayed in the address bar of your browser is spelled and formatted correctly.
HTTP Error 405 - The HTTP verb used to access this page is not allowed.
Internet Information Services (IIS)

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This is the URL that is being displayed at the login screen:
{http://www.phoenixcolony.com/blogs/htsrv/login.php?redirect_to=%3Fpaged%3D1%26amp%3Bpage%3D1%26amp%3Bdisp%3Dposts}

After not being able to logon I created a new user and was successful, however I was still presented with the same error when I used the login info for the newly created user. I was able to page back to the previous 'Settings' screen and deselect 'Enable New User Registration'.
I was asked to login again, entered my information (and it was sucessful), had to repeat deselecting 'Enable New User Registration' (I was taken directly to the Settings screen) and clicked Apply. After disabling that feature I was able to logon and off repeatedly without incident.

If an admin/moderator/bug-squasher would like access to my server for their testing needs feel free to contact me.

- Phoenician

UPDATE:

It appears that it actually has nothign to do with enabling 'New User Registration'. It seems like IIS 6.0 does not like the way 9.0.8 handles the logon URL. Or it could be a PEBKAC issue.