Fatal trap 12: page fault while in kernel mode

This seems to happen as soon as pimd tries to subscribe to a remote multicast source.
I have just rebuild the pfSense VM to be a FreeBSD 11 64Bit machine where as before it was an other 32bit
It has 3Gb memory and 2 CPU

Basic idea is to have multicast groups been able to flow across site - for required groups.
In the lab I have:

MC Source -> pfSense -> LINK network -> pfSense -> MC Subscriber

I have had this working with just one pfSense and the Source and Subscriber on two different vlans - Just need to give PIMD a BSR and RP candidate and then the Multicast works (firewall rules with the advanced allow extra options enabled)
I used the link network above to take any Multicast though NAT been an issue (my home network is the WAN side of both pfSense machines)

It seems to be the moment the subscribing pfSense router receives multicast traffic is when pfSense crashes