PMDG 777-300 ER and Hyperthreading no sound in cockpit

Hi,

I have a i7-920, running at 3.8GHz and with Hyperthreading enabled.

I included AffinityMask=84 under JOBSCHEDULER in the fsx.cfg file.

When I started the flight with PMDG 777-300ER, there was no sound in the cockpit, but outside views, there is sound, but a bit muffled.

Has anyone else experienced this ?.

I used a Logitech 5.1 system, and I tried it under 5.1 as well as Stereo, by changing settings in the control panel, but still no sound.

Once I remove the affinitymask entry and restart the sim, the sound returns.

Thanks

Hari