I'm no web dev, just a simple human being with two functionning eyeballs but also a professional photographer so here's my two cents on the visual aspect of this beta : it HURTS the eyes. The lighter, more yellowish grey theme is much more easier on the eyes. The overall darker and bluer theme is harsh. That's no rocket science here. I think we'll always adapt to new/modified features and UI in the end, our brains work this way, but how our eyes cope with light and colors isn't so flexible. Please consider going back to something lighter and "warmer".