we had this issue after upgrading to 6.0.5-h3 with our Citrix Netscaler Loadbalancer.
There is a feature called MBF (MAC based Forwarding) which was turned off on our Citrix Netscaler.
If MBF is disabled, the return path is determined by a route lookup, or is sent to the default route if no specific route exists.
With MBF instead it caches the MAC address of the uplink router that forwarded the client request to the appliance.
So after turning on the MBF on the Netscaler the SYN/ACK packet went to the PA instead direct to the client via a Netscaler Interface.
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