So I installed the 11.1 RC 2 yesterday and it was running fine until this morning the Mail app decided it would no longer open up. I tried everything to fix it and resorted to formatting the drive and reinstalling 11.1 RC 2 clean. Everything went find until I got to the part where you create a user account. I got an error that says "The name you used can't be used" and it wouldn't create the account. I tried other names just to see if it were something with my account. I wiped it a second time and got the message "Computer account creation failed - Your computer account could not be created with the name and password specified. Please Try again." When I gave up and rebooted...then the login screen with both accounts I tried to created (that presumably failed to create) and when I attempted to login to either either of them it would say the password was incorrect. I'm at a total loss on how to complete a clean install. What am I doing wrong?