Well, I'll be damned. Your log message gave me the clue. I was simply missing `modparam("jsonrpcs", "transport", 1)`. I must have missed that in the upgrade.
Maybe that parameter should be added to the default kamailio.cfg since the `Default value is '6' (fifo and datagram transport).`
Sorry @miconda. But I guess it shouldn't segfault either ;) Thanks again.