I’m not sure what the issue is, but it seems that in the most recent beta the shading of objects is “off.” Take a look at the render of my winter scene from Decemeber and then a render I did of it today. The difference is especially visible in the deer.
Disclosure: The new render does have an added focal effect and the original has light post-processing effects applied to it.
Also, I did find a bug when going through the new beta. The alpha slider bug that was fixed previously appears to be back. Hopefully all this helps. Thanks for the continuous work on the app.