I've got a tricky, obscure minor issue, and I'm curious if anyone out there has the answer. Periodically, I'll notice that most of my audio is coming out of my right speaker. Sure enough, I'll go to system preferences, Audio, Output, and the balance is partially panned to the right (the amount always varies). My theory is that there's some keystroke combination I'm accidentally tapping that triggers this. Running 10.4.2. Any clues?