Yeah, that may be it. Of course, when dealing with these pluses now I have to go into the land of 800k floppies.
But using the SE (which has ethernet on board via the Asante card) I have verified that my appleshare setup is ok using netatalk- that is, I can see and mount the volume. I've used a fresh install of 6.0.8 that I did myself, adding the network drives for the Asante and then copying over Appleshare from a 7.5 install (which is the latest version to use back with 6.0.8 as far as I can tell from reading sites.
I'll continue to play with this till I get it. It's a brand new from the box Asante Microprint, so I'm sure it's not an issue with that bridge.