when i plugin my headphones into my new 2011 "15 MBP, i could still hear sound coming from the speakers as well as the headphones. If an application is already opened before i plugin my headphones, it would still use the macbook speakers. I have to close it and reopen it again while having the headphones plugged in for it to use the headphones. This is a really weird behavior in Windows, any idea what is happening here?