CvPcb not starting

using OSX 10.11.4 and KiCad 4.0.2 nothing happens when i klick the CvPcb button.
It was working some weeks ago, in the meantime i updated to nighly builds and now i’m back on 4.0.2.
How to reproduce:
new Project
open eeschema
pick and place a resistor
do an automatic annotation
create a net list
click on the CvPcb button
nothing happens

Any ideas what went wrong?

Problem solved by deleting the ~/Library/Preferences folder