It sounds like you may have an MTU problem. IPSEC overhead means that you don't have the full 1500 byte MTU any more. If the ICMP replies required by PMTU (RFC 1191) aren't getting back to the two end stations then you'll get an initial connection but as soon as you start sending any amount of data the link freezes up. You can try changing the MTU on one end-station to around 1400 and see if you start to work. A better solution may be to allow the ICMP unreachable packets through to the end stations.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...