Today I tried the newest Nautilus point release 3.6.1 from Gnome3 PPA.
Well that build is broken.
Nautilus will not even start.
And yes I do know there isn't yet a Raring series in that particular PPA.
But that is not the issue here.
Downgraded manually back to the version 3.6.0 of the very same PPA and all is well again.