No worries: there are no dumb questions.
Actually, this is the first time someone reports not being able to login. Do you see any error or other message?
Just to be sure, the credentials for all applications are: username debbie and password secret123.
The databases (action and membership) used in the Silverlight app have the exact same content as the Patterns in Action solution.
They reside under the App_Data folder.
At this point my best suggestion would be to set a debugger breakpoint in the login page, then step through and see where it fails.
Hopefully, this gets you going.
Dan McMillan, Mar 31, 2011