Thanks for all the help and suggestions guys - however, the obvious solution has been staring me in the face all this time...my old iBook, running OS 9, makes a perfect go-between for the SE/30. I tried deleting the AppleShare preferences - but it still gave me the bus error. Oh well. On the bright side, I can get to the Internet on the SE by way of the MacBook, which is kind of nice.

Thanks again!