Softflowd with Netflow Analyzer

Has anyone had experience using the Netflow sensor 'softflowd' on a Linux system http://www.mindrot.org/softflowd.html with Netflow Analyzer. I've got my Cisco routers sending Netflow v5 flows to the Netflow Analyzer and they show up fine.

When sending the flows from softflowd to 'flow-tools' http://www.splintered.net/sw/flow-tools/ ; the collector picks up the data fine.

However when using softflowd -v 5 -n x.x.x.x:9996 where x.x.x.x is the Netflow Analyzer, nothing shows up although a packet sniffer shows lots of udp 9996 port traffic going to the machine running Analyzer.

If I change the version of netflow packets to -v 1 for example Netflow Analyzer complains that it is not receiving v5 or v7 Netflow packets; which is expected showing at least that it does seem to be talking to the Analyzer.

Has anyone tried softflowd with Netflow Analyzer? Or are there other *nix based sensors that others have had experience with?