"ports" RRD graph not showing up

I'm running Hobbit 4.2.0 and just added a PORTS section for one of my hosts.
It looks like the server is checking the ports correctly, but the RRD
graph isn't showing
up, even with the TRACK statement.

        PORT    LOCAL=%[.:]4001$ STATE=LISTEN HOST=<hostname>
        PORT    LOCAL=%[.:]5001$ STATE=LISTEN HOST=<hostname>
        PORT    LOCAL=%[.:]5002$ STATE=LISTEN HOST=<hostname>
        PORT    LOCAL=%[.:]4001$ STATE=ESTABLISHED TRACK=4001 HOST=<hostname>
        PORT    LOCAL=%[.:]5001$ STATE=ESTABLISHED TRACK=5001 HOST=<hostname>
        PORT    LOCAL=%[.:]5002$ STATE=ESTABLISHED TRACK=5002 HOST=<hostname>

I don't see anything of interest in the client or server logs.  Any ideas?