Pro System Emulator / Windows 8

I'm running 64bit Windows 8 and I'm wondering if the following is a problem on all versions of Windows or specific to my Windows 8 set up.  If I'm running a game with Pro System Emulator and I move the emulator window, the sound gets messed up and I hear a lot of static like noise along with the game sounds.  Is this a known issue?  I read in another post that there is a beta of a new release of Pro system.  I'd like to see if the problem persists in the current beta.  Is it available to the general public?  If so, can someone point me to where I can download it.

Thanks,

Bob