validation_errors() returning an empty string after upgrading to 2.1.0

[eluser]mcryan[/eluser]
I started from a clean installation of CI 2.1.0 created a new controller and views and it worked fine. I think one of my config files or something else in the application directory must be broken. I used identical code on the new instance that worked and the existing instance and it failed again, so it has to be that.

I'll update here once I crack this one. Will give it another go later on.