Ipsec multiple tunnels one-way traffic

[andyb2000]

Hi All,
Bear with me on this one, it might take a bit of explaining!
We have a Juniper  NetScreen-25 at our office, with LAN of 192.168.2.0/24
At home I have a pfsense 1.2-RC2 (built on Mon Aug 20 12:41:04 EDT 2007) with LAN of 192.168.55.0/24

I created an IPSEC tunnel between the two, and can route both directions no problem at all, I added firewall rules to protect my home/work networks accordingly, and that all works.

I now want to route to our second LAN block at work 192.168.66.0/23

So based on instructions in the forums I created a second IPSEC entry on the pfsense box pointing to the .66 network, created a mirror of this on the netscreen, and that tunnel then came up.
So from home: I could ping 192.168.2.x and 192.168.66.x traffic was fine.
From work: I could NOT ping 192.168.55.x or connect to anything on my home network.

Can anyone advise why this might be happening?
I have tried disabling all but the default allow anything IPSEC firewall rule, and no difference.

Thanks in advance for any suggestions to try!