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