Many shared hosting providers (in this case Mosso) run your ASP.NET applications in a medium trust or modified medium trust environment to reduce security risks. This causes issues with certain techniques and components that require permissions removed by medium trust.
One of the biggest issues other than the actual restriction of permissions is the restriction of partially trusted assemblies calling fully trusted code. By default, if an assembly is strong named, partially trusted assemblies (i.e. the application assemblies in your app running under medium/partial trust) can't call it. This hits many open source components such as iBatis and NHibernate. The workaround...