Emulator

What's the problem?
While playing a game that uses Miis the face of the characters can sometimes disappear. The faces sometimes reappear, sometimes don't.

Dolphin version with the problem (as it appears in the title bar, Ex.: "R
4779" or "R 6403M"):
R 6698

Operating system and version:
Windows 7 Ultimate 64-bit

Game ID (as it appears in game properties, Ex.: "GZ2P01" or "RSBE01"):
Wii Sports PAL (RSPP01)
Wii Sports Resort PAL (RZTP01)
Mii Channel
... and I guess with every other game that uses Miis

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

Please provide any additional information below.
Model: Acer Aspire G7700
CPU: Intel(R) Core(TM)2 Quad CPU Q9450 @ 2.66GHz
RAM: 2x2GB DDR2
GPU: 1xNVIDIA GeForce 9800 GTX/9800 GTX+ with latest drivers

These are some screenshots taken from Wii Sports. I couldn't get some from Wii Sports Resort since the current revision doesn't support the Wii Motion Plus and therefore I couldn't get in-game.

Tennis:
http://img64.imageshack.us/i/rspp011.png/
http://img213.imageshack.us/i/rspp012.png/

Bowling:
http://img560.imageshack.us/i/rspp013.png/
After going to pause menu and pressing Restart:
http://img266.imageshack.us/i/rspp014.png/