Anti aliasing causes right eye to turn white

I've seen that happen running the hydra tuscany demo on Fantastic quality setting (windows). Changing the setting down to fast fixed the problem. I wouldn't be surprised if AA was the root cause. A temporary workaround is to run the game fullscreen at a higher than native resolution, (such as 1920x1200), which will get scaled down by the rift and produces an AA-like effect.