nfcapd - Process_v9: Corrupt data flowset? Pad bytes: 6 | 12

I'm seeing errors when running nfcapd as part of a nfsen installation.

The error is:

Process_v9: Corrupt data flowset? Pad bytes: 6

Sometimes Pad bytes is 12.

I see some flows that just don't fit the environment - millions of 
packets per second with source and destinations that couldn't possibly 
be found in my network.

This is nfdump 1.6.6, nfsen 1.3.6p1.

The exporter is pfsense 2.0.1-RELEASE (amd64) I am exporting in Netflow 
v9 format using the pfflowd 0.8.2 package.

Sample TCP dump of my exports are attached (I export to UDP 9999).

Any ideas what the problem might be?

--

-- 
Regards,

Giles Coochey, CCNA, CCNAS
NetSecSpec Ltd
+44 (0) 7983 877438
http://www.coochey.net
http://www.netsecspec.co.uk
giles@...