Make sure the tables are named in upper-case in your database. When you use "CREATE TABLE" statement, you will need to quote the table name so that the case can be preserved.
I am starting to use Yii and just would like to say that you created a really nice software framework.
My main experience with programming is with Delphi and C#.NET.
Some years ago I saw PRADO and it's fantastic Event Driven aproach, but did not have any opportunity to use it, since I was programming mainly in .NET.
Now I'm back to PHP (but still with .NET), and after reading that you are moving PRADO efforts to Yii, I have studied MVC and started with Yii.
My only complain (but do not care about it) is that I prefer the ASP.NET like PRADO notation that Yii notation: