Hi! Nasty one this, might bite people

When you bring up your dialup connection whilst in X, this
(obviously) changes the hostname. Unfortunately this has
the effect of breaking the new X authorization method.

So I hit the button to bring up my ppp link, and then..
oh dear X won't let me launch any new windows.

n.b. the new X authorization stuff is _great_ for security
so please don't revert that change :-)))