Antlr3.runtime access denied after updating deployed files

Question

We have an ASP.NET application that was written by a former employee that I have thus far been holding together with duct tape. The app was written with MVC, NHibernate and

Answer 1

Just fixed this one. A new reason:

The ACLs on the deployment folder had become messed up (eg. bin folder showing, in Explorer's security advanced view, inheriting permissions not from its parent, but its parent's parent).

A quick reset permissions from the site's root and all started working again.