rotorcraig, I can't find any more recent drivers. I suspect
Irish Steve is probably on the right track, since it started after I installed XP. But I didn't change any user settings, don't think I was even prompted to, and there are no restrictions on either computer on the network that I can tell. Having said that, the intricacies of networking are a little beyond me.
I think I'll just have to get used to the idea of deleting the print queue after printing every time until a guru comes to the house for some other reason.
Thanks for the suggestions anyway.