Thanks for all the suggestions. It's definitely a problem with network traffic confusing the X11 event handler. If I ssh from a virtual console it works fine and if I cut-and-paste into an ssh session in a GNOME terminal that works fine too. And if I run KDE the problem recurs, so it's not GNOME-specific. I'm still a bit perplexed that everything works fine with a 56k modem connection, but I'll try upgrading X and see how that goes.
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