Agreed, this is tough territory, also for me.
I would not suspect
collective.cookiecuttr though, but its dependency
collective.z3cform.datagridfield, especially since you say that downgrading this to 1.3.1 helps.
Ah, and I see that this is a hint:
Since version 1.5.0 of this package, its
setup.py is almost empty, and the configuration is moved to
setup.cfg. See this commit.
@jensens, since you made that change, do you have an idea?
@dbitouze, you could try upgrading your setuptools to the latest version, as that may be needed to be able to parse the information from
setup.cfg. You might want to upgrade
zc.buildout to the latest version while you are at it.