I didn't know the problem also occurs when Win7 is on the client-side of a peer-to-peer file share connection. What does seem to be consistent is that one of the two machines is not a Windows 7 machine (or Vista for that matter).So far I guess I'm still sticking with my statement that perhaps Windows 7 doesn't play nicely with other OSs on a peer-to-peer network. (And for this purpose I would guess that Vista and Windows 7 do play nicely with each other, being effectively the same OS in this regard).