Did you enable NetFlow on any of your interfaces? The ip-flow export source only tells the switch switch interface to source the NetFlow traffic from. If you do a show ip flow interface, it will list all the interfaces you have flow statements on. To enable an inteface for Netflow, you go to config mode for the interface and enter ip flow ingress or ip flow egress. (Some older version of IOS don't support ip flow ingress or ip flow egress. For those version, the interface command is ip route-cache flow.)
Most of the Netflow configs I've done are on routers, switches work a bit differently. You might need to put an ip route-cache flow statement in global config mode to enable Netflow.
One other thing to check. The IP address of the Netflow source must match the IP address Orion is using to monitor the node. If the source of your Gig 5/1 interface doesn't match the IP address in Orion, the Netflow module will never see the flow.
If all else fails, check the Cisco config guide chapter on Netflow here:
Hope this helps.
got it working this way....
ip route-cache flow infer-fields
ip flow ingress infer-fields
ip flow-export source GigabitEthernet5/1
ip flow-export version 5 peer-as
ip flow-export destination 10.10.245.1 2055
found a document here: http://www.solarwinds.com/support/Netflow/docs/OrionNetFlowSwitches.pdf