Hello,
I'm the developer of X Resource Graph. XRG gets it's network statistics by using BSD system calls, not by running netstat. I haven't heard of anyone else having problems. If you do find that XRG is the cause of your problem though, let me know, and I will take a look at the code and try to fix it.
Good luck finding out what is causing your netstat issue. Let me know if there is anything I can do to help.
Mike Piatek-Jimenez