more of an aspiration than a claim

Could not load type ... from assembly 'System.Web profile...

If you get the error Could not load type from assembly ‘System.Web profile when doing something like a unit test and trying to make a profile, you probably need to add the assembly name to your class declaration.

eg, using System.Web.Providers and the new inherits feature to specify your Profile:

<profile defaultProvider="DefaultProfileProvider" inherits="RationaldDev.Models.Account.MyCustomProfile, RationaldDev.Models">