It was the issue. Hard one to find for sure. Thanks!
On Sep 3, 2013 9:03 PM, "Stefan Monnier" <monnier@iro.umontreal.ca> wrote:

> > This might have to do with that the package advices `princ', which seems
> to
> > be used in the byte compilation process. I've pushed a fix and waiting
> for
> > MELPA before I can verify this.
>
> That could explain it, indeed.
>
>
>         Stefan
>