Symptom: your ASP.NET application restarts periodically, supposedly because of "IIS configuration change" - problem is, nothing changed. And nobody seems to figure out what is happening.

Debugging a weird custom IIdentity serialization issue.

Error "The type 'System.Object' is defined in an assembly that is not referenced." but... how can System.Object not be defined when the CLR is running?

One thing people loved about Xslt in Umbraco was the declarative syntax and Xslt picking the right template, where Razor requires giant switch statements. Strongly-typed models help bring declarative syntax into Razor.