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On initial warmup after creating a Blog you get lifescope issues with BlogPathConstraintUpdator
Create a Blog.
Restart you Cassini instance.
F5 with exceptions on.
You should end up with this exception:
No scope with a Tag matching 'work' is visible from the scope in which the instance was requested. This generally indicates that a component registered as per-HTTP request is being reqested by a SingleInstance() component (or a similar scenario.) Under the web integration always request dependencies from the DependencyResolver.Current or ILifetimeScopeProvider.RequestLifetime, never from the container itself.