Emulator

What's the problem?
Large black areas appear in-game when playing Sonic Heroes (NTSC US).

Dolphin version with the problem (as it appears in the title bar, Ex.: "R
4779" or "R 6403M"):
R6798

Operating system and version:
32-bit or 64-bit:
Windows 7 Ultimate 32-bit
Intel Core 2 Duo Q9550
4GB DDR2 RAM (3GB usable)
NVIDIA Geforce GTX 465, driver version 266.35

Game ID (as it appears in game properties, Ex.: "GZ2P01" or "RSBE01"):
G9SE8P

Was the ISO a plain dump from disc, compressed and/or scrubbed?
Plain dump

Please provide any additional information below.
Glitches disappear if using the Direct3D11 plugin, EFB scale is set to 1x, and antialiasing is off. All other plugins are glitched in all settings.
Video at http://www.youtube.com/watch?v=w6BnEoAcbwI&hd=1