Hi Drichfield,
Unfortunately a recent security change now prevents the ability to manage users and roles from IIS Manager using providers provided as part of your application (think /App_Code or /BIN).
To work around this, you can compile the provider into a strongly-named signed assembly, and register it in the GAC. Then, use the full assembly-qualified type in the provider's configuration to identify this provider. This will allow you to use IIS Manager, which is by far the easiest way to create and manage Membership users.
Without IIS Manager, you can still create and manage users using Membership APIs directly even if you use application-based providers, but that requires you to write a custom page to manage the users or roles. You can use the CreateUserWizard control to quickly do this in an ASP.NET page: http://msdn2.microsoft.com/en-us/library/ms178334.aspx.
As far as your "Could not load type error", can you show the contents of your web.config file, particularly the <membership> configuration section?
Thanks,
Mike Volodarsky
Program Manager
IIS Core Server
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