Emulator

What steps will reproduce the problem?
1.Run metroid prime 3 and go until the fight against the defense drone fight (about the last part of the combat), or when defending the celestia platform against pirates in the sky

What is the expected output? What do you see instead?
Fog should be transparent, but it's filling the screen and hides everything, making the game unplayable as you're totally blind.

Dolphin version with the problem? Other Dolphin version without the
problem?
Current versions (around 5950), dunno about older ones.

32-bit or 64-bit and any other build parameters?
64 bit

OS version and versions of tools/libraries used?
Win 7

Please provide any additional information below.
I'm not sure it's a priority but I thought it can be the symptom of some underlying more important issue, otherwise just ignore this report.
No rendering option helps, the only way to somehow see is to enable wireframe. Both DX9 and OGL are affected, dunno about DX11 as it doesn't work here. GFX is nVidia 9500GT. I could'n make a screenshot but there's nothing much to see beside a red fog with the HUD on top