First
"Database diagram support objects cannot be installed because this database does not have a valid owner.”
Then
"Do want to make yourself the owner or impersonate ..."
Then
"Could not obtain information about windows NT group/user 'XXX\XXX', error code 0x534”
I think it all started when I tried to rename my database, or I ran a registry fix and that is what did it.
I also checked the ownership and it is correct
"Success is the Sum of Small Efforts, Repeated Day in and Day Out - Without Ceasing!"
Robert Hall
CEO and Founder
My Service Solutions, Inc.