Maybe I am an idiot, but I don’t see anything at:
http://expressionengine.com/docs/installation/update.html
That warns a person to also reinstall the multiple site manager files in the replaced directories.
That’s 10 minutes I’ll never get back. 😊
Seriously, thought someone had hacked my site since it wouldn’t take my password.
All is well though after I reuploaded the MSM files.