> > >
> > Did you run
> > . setuptex
> > in tex directory (watch for the initial dot!) ?
>
> Hmm, I think this was it. Until now this wasn't necessary. Perhaps
> something else changes.
>
This is a must .
Always ensure to do
. setuptext
exactly one time before start your luatex session.

More
. setuptext
can mess your env. vars ($PATH etc)


-- 
luigi