after working in Windows for a bit and adding a skylight that renders fine, I loaded up my scene in OS X and skylight creates a really crazy overbrightness. I tried it with a new scene and it was also a problem. See attached screenshot in OS X.
I’m also seeing this bug. I worked around it by using ambient cubemap in postprocess settings. For my large outdoor scene it actually looks exactly same as skylight is supposed to (assuming a matching cubemap), but with ambient cubemaps you lose precomputed shadows (so indoor sections won’t look right). Not a permanent workaround but it lets me continue my work for now.
I have same issue; it only occurs in a file that was created on windows. Even if I delete skylight and create a new one, problem persists. However, on a different map on same computer (in which I followed level building tutorial), if I add a skylight, it works fine.