I upgraded to 22.214.171.124 from 126.96.36.199.
When I go through checkout and select ship to a different address other than billing no form keys seem to be present in the header. (saveShipping)
When you go through checkout and select ship to this address form keys are used (saveShipping method)
I have reverted from my template back to rwd which is default.
I have been through all of the onecart and multishipping files in base and rwd folders, and all appear to be correct based on other peoples issues previously.
If I switch form keys off it all works, and I can get to payment section.
Does anyone have any thoughts or areas where to look?