Can't create a usable run configuration in IDEA 13 EAP

I'm using build 132.556, with the Scala plugin version 0.23.259.

When I try to just "compile", I get a mass of bogus errors and no object
files are created. I tried switching over to using Ant to do the
building, but IDEA doesn't add the "output directory" that I have
configured in my project to the classpath and so, it can't find any of
my test classes.

This is BASIC STUFF, that should JUST WORK. If there's some important
configuration stuff that I've overlooked, then I haven't been able to
find it.