I don’t either.
Just the simple act of inserting my headphones would normally mute the laptop speakers and forward the sound to the headphones. Now not only is it some semi-complex affair where I need to cut off the speaker source so that the sound ONLY comes from the headphones for all of Windows, but even then it won’t play through ppro cs3 after doing this.
It DID however w/ ppro CS4, which puzzles me.