353332 (1) [Avatar] Offline
On page 28 it walks you through creating database diagrams. It specifies that you have to set an owner of the DB before you can create a diagram. I follow the steps as follows:
1) Right-click the DB
2) Click Properties
3) Go to the Files section
4) Click on Owner
5) Specify an account (in this case I am using mixed mode, and trying to specify my presently logged-on domain account which is the machine's local admin)
6) Click OK
7) Click Database Diagrams

I again get the error that the DB does not have a valid owner.

If I specify sa as the owner I can proceed as normal.