UTM to XG IPSEC site to site vpn, cant ping remote lan.

I have UTM;s at remote sites and i upgraded mine to XG but i got IPSEC to work and connect but all but one wont ping accross.

I have tried to match settings but it still wont have it, what should i look at?

Just to add the VPN in question when i look at the remote sites UTM firewall live log i can see the traffic so its reaching the remote site, but the colour is white.  What does white mean?

Thanks