See comments on this latest Xinerama/Randr braindamage at https://bugzilla.redhat.com/show_bug.cgi?id=389501
Given that xscreensaver *worked fine* before the latest Randr started causing Xinerama to claim that screens exist where there are no screens, I consider this a Randr bug.
There may be a way to work around it in xscreensaver, but as I do not possess a computer capable of exhibiting this latest Randr braindamage, don't hold your breath.
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