Hi gunrunnerjohn,
earlier you mentioned "Connect all the equipment, including the router, to the switch." Do you mean run everything to the router and then through the switch, or did you mean connect items to the switch independently?
I've now at the point where I'm not sure what to do next. I've gone through downgrading the firmware on both the NAS as well as the router to various previous levels (each time restoring to factory defaults) and there seems to be no combination that works. So I've brought them both back up to current (non-beta) firmware revisions. Regardless, the NAS only works when connected to my older Linksys router, which is running at 100 Mbps. One thing I have noticed is that when I connect the NAS directly to the gigabit switch it does not establish a connection there other (however I'm not sure what is happening with respect to the ip address). That said, it makes me wonder if there is the fault really lies with the NAS.