after working in Windows for a bit and adding a skylight that renders fine, I loaded up my scene in OS X and the 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.
Mac Pro 2013 FirePro D700 OS X 10.9.2
I’m also seeing this bug. I worked around it by using the ambient cubemap in the postprocess settings. For my large outdoor scene it actually looks exactly the same as the skylight is supposed to (assuming a matching cubemap), but with ambient cubemaps you lose the precomputed shadows (so indoor sections won’t look right). Not a permanent workaround but it lets me continue my work for now.
I have the same issue; it only occurs in a file that was created on windows. Even if I delete the skylight and create a new one, the problem persists. However, on a different map on the same computer (in which I followed the level building tutorial), if I add a skylight, it works fine.
I apologize for the delay in response. Is this issue still occurring in 4.2.1? If so, please let us know so we can try to find the cause. Thanks!
For me the issue was resolved with 4.1