The documentation says:

The Morning After is known to work with zen-6.x-1.0-beta2.tar.gz and zen-6.x-1.0-beta3.tar.gz. Future versions of Zen should also work, but if you run into problems, please try downgrading to one of these two.

I want to report that I have no problems with zen 1.1 & 1.2

Maybe if have some more to confirm we can update the modules describtion.