Comment 2 for bug 332370

I don't know the internals of any of this software, but my guess is that workrave is blocking my input, preventing the X server or screen saver from realizing it needs to draw the screen. Given that this only happens with workrave, only when workrave is blocking input, and killing workrave fixes the problem, returning me to a fully functional desktop, I would be shocked if this is an X.org problem.