Hi, I'm running the latest release of Workrave on Gnome 2.6 (Ubuntu Unstable
release) although this problem has been happening as long as I've been using a
duel screen display. 

Basically, when the time comes for the screen to blank, Workrave spreads across
the last "active" monitor - the one I last clicked on - and the one to the
right. This is fine when I last clicked on the left hand monitor, but otherwise
it centres the dialog box half on the righthand monitor and half over a
non-existant monitor to the right of that, leaving the left hand monitor alone
(But still rejecting inputs).

From there I can see Ms Workrave's handy exercises, and the "Lock" button, but
no way of postponing or skipping the rest break (Yes, I'm a bad person and
shouldn't, but still)

Multihead was broken. Fixed.