Emulator

What steps will reproduce the problem?

1. Playing Zelda: Twilight Princess GC (using Open GL plugin)
2. I am not using the native resolution nor texture size.

What is the expected output? What do you see instead?
I am expecting a clear picture. Instead, the top left fourth of the screen
gets blurry.

What version of the product are you using? On what operating system?
Dolphin.exe - SVN R 4788 - Windows XP SP3

Please provide any additional information below.
Enabling the Bleach Versus Crusade hack resolves the problem, but instead
removes bloom lighting and the shadows. If I disable EFB copy in the Open
GL plugin, the same part of the screen becomes garbage (and including the
map in the bottom left corner).