NetFlow Analyzer cannot see my router. Is multihomed PC not supported?

NetFlow Analyzer cannot see my router. Is multihomed PC not supported?

Trying out the NetFlow Analyzer for the first time and it will not see/recognize my router. All I get is:
 
  "No device is currently exporting NetFlow / sFlow packets to NetFlow Analyzer."
My router is a Cisco 2920 with IOS 15.0(1)M3.
 
I've gone thru all the steps to enable netflow on the router and verify that it's working via the "show ip flow export" command, which gives my source and destination addresses correctly and tells me this...
 
#sh ip flow export
Flow export v9 is enabled for main cache
  Export source and destination details :
  VRF ID : Default
    Source(1)       192.168.225.1 (GigabitEthernet0/0)
    Destination(1)  192.168.225.254 (9996)



Version 9 flow records
  121367 flows exported in 4193 udp datagrams
  0 flows failed due to lack of export packet
  0 export packets were sent up to process level
  0 export packets were dropped due to no fib
  0 export packets were dropped due to adjacency issues
  0 export packets were dropped due to fragmentation failures
  0 export packets were dropped due to encapsulation fixup failures




 
 
My PC is Window 7 professional, but it is multihomed. My primary network interface is on a purely internal LAN, and has a default gateway to a different router that routes to other different internal LANS. It has a second NIC that has the ip address 192.168.225.254 on the subnet of the particular C2920 router (192.168.225.1) that I wish to monitor.
Wireshark confirms that the CFLOW datagrams are indeed arriving at the second NIC in my PC.
 
But NetFlow Analyzer simply does not see the router at all. If I try to add the device manually, after entering the correct ip address and snmp parameters and hit the scan button, I get this error: Policy Not Available.Device Adding Failed
 
Is this software not suitable for running on a multihomed Windows PC?
 
I suspect it is binding to the first NIC only in the PC, which is on a completely different IP subnet, and I can find no way to tell it to bind to a particular NIC in my PC (the 2nd one, on the subnet I wish to monitor and analyze).
 
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