(In reply to Alex Deucher from comment #2)
> What display types are you trying to use?  Using dongles?

On my home setup (which this was also seen with), nothing special. Just two
1080p DVI displays and one 1080p HDMI display. I've managed to reproduce it at
work with a similar setup as well (although there's one passive HDMI-DVI
adaptor in the mix, but I'd be surprised if that made a difference). It only
ever seems to happen with >1 display though