Emulator

What steps will reproduce the problem?

1. Start Wii Music
2. Play a little (For example, try to follow the tutorial).

What is the expected output? What do you see instead?
Wii Music freezes after some random time (can be 1 minute, 5 minutes,
etc...). When game freezes, FPS counter drops to 0 (FPS: 0), but instead
the SPEED counter is kept at 100%, and music remains playing. Also after
the freezing if you drag the window outside the margins of the desktop, the
game screen is not updated, appearing black areas as you can see in the
screenshot attached.
Game worked fine without issues until r4758. It seems that the problem
comes from r4759.

What version of the product are you using? On what operating system?
I'm using r4922 x64, windows 7 x64. Amd x2 64 4200+ 4 Gb Ram, ATI Radeon
HD4850

Please provide any additional information below.
It seems that with "Dual Core" setting disabled game works without freezes.
Or at least that is my impression.