My disk crashed so I reinstalled SQL Server to a new drive and restored my databases from my backup drive. However, when I attempt to install Diagram support, I get this message:
Cannot execute as the database principal because the principal "dbo" does not exist....
This issue is admirably answered here but the reply doesn't seem to apply in my case since running the first query in the "Solution" section returns no records so I have nothing to fix, yet I get that error message.
Please inform me how to resolve this matter.